PUTNAM ENERGY RESOURCES TRUST
N-30D, 1995-05-08
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PUTNAM NATURAL RESOURCES FUND

SEMIANNUAL  REPORT

FEBRUARY 28, 1995

[LOGO]
BOSTON * LONDON * TOKYO

<PAGE>
PERFORMANCE HIGHLIGHTS
Lipper Analytical Services ranked the fund's class A shares  among
the  top  10% of all natural resources funds tracked  for  the  12
months  ended  February 28, 1995, and among the top 25%  of  those
tracked for the five years ended February 28, 1995.*

"In the year [Fund Manager Jeanne] Mockard has been with the fund,
she  had  added  value to returns while also mediating  volatility
through a more diversified, value-oriented approach."(+)

- -- Morningstar Mutual Funds, March 3, 1995

Performance  should  always be considered in  light  of  a  fund's
investment strategy. Putnam Natural Resources Fund is designed for
investors  seeking  capital appreciation  through  investments  in
energy and other natural resources industries.

SEMIANNUAL RESULTS AT A GLANCE

<TABLE><CAPTION>
<S>                           <C>       <C>       <C>       <C>
                                 CLASS A             CLASS B
TOTAL RETURN                  NAV       POP       NAV       POP
- ------------------------------------------------------------------
- --
(change in value during
period plus reinvested
distributions)
6 months ended 2/28/95     -0.50%    -6.23%    -0.84%    -5.73%
- ------------------------------------------------------------------
- --
Share value                   NAV       POP                NAV
- ------------------------------------------------------------------
- --
8/31/94                    $14.73    $15.63              $14.65
2/28/95                     14.41     15.29               14.32
- ------------------------------------------------------------------
- --
                                              CAPITAL
DISTRIBUTIONS                 NO.    INCOME     GAINS     TOTAL
- ------------------------------------------------------------------
- --
Class A                         1    $0.235        --    $0.235
Class B                         1     0.198        --     0.198
- ------------------------------------------------------------------
- --
<FN>
Performance data represent past results and will differ  for  each
share class. For performance over longer periods, see pages 8  and
9. POP for class A shares assumes 5.75% maximum sales charge. CDSC
for  class  B shares assumes 5% maximum contingent deferred  sales
charge. Past performance is not indicative of future results.

*Lipper Analytical Services is an independent research firm  whose
rankings  vary over time and do not include the effects  of  sales
charges. For the periods ended 2/28/95, the fund's class A  shares
were ranked 3 out of 29 funds for one year, 4 out of 18 funds  for
five  years, and 4 out of 7 funds for ten years. Class  B  shares,
which  have  been offered since 2/1/94, were ranked 4  out  of  29
funds for the one-year period ended 2/28/95.

(+)Morningstar is an independent research firm that rates funds
relative to funds with similar objectives, based on risk-adjusted
medium- and long-term performance, as applicable, and adjusted for
sales charges. Past performance is no assurance of future results.
</TABLE>
<PAGE>
FROM THE CHAIRMAN

                                          [PHOTO OF GEORGE PUTNAM]
                                                 (C) KARSH, OTTAWA

DEAR SHAREHOLDER:

FEW  SECTORS OF THE STOCK MARKET ARE AS SENSITIVE TO THE  ECONOMIC
CYCLE  AS THE COMPANIES IN THE NATURAL RESOURCES INDUSTRIES.  WHEN
BUSINESS  IS  GROWING,  PRODUCERS NEED FUEL,  RAW  MATERIALS,  AND
PACKAGING TO MANUFACTURE AND MARKET THEIR GOODS. WHEN THE  ECONOMY
SLOWS, NATURAL RESOURCES SUPPLIERS ARE AMONG THE FIRST TO FEEL THE
PINCH.

WITH THE CURRENT ECONOMIC EXPANSION NOW IN ITS FIFTH YEAR, AND THE
IMPACT  OF RISING INTEREST RATES NOW APPARENT, WE ANTICIPATE  THAT
MANY  OF  THE  COMPANIES  IN WHICH PUTNAM NATURAL  RESOURCES  FUND
INVESTS  MAY  BEGIN  TO EXPERIENCE SHRINKING DEMAND.  BECAUSE  THE
VARIOUS  SECTORS  WITHIN THE INDUSTRY DO NOT EXPAND  AND  CONTRACT
CONCURRENTLY, FUND MANAGER JEANNE MOCKARD CONTINUALLY ADJUSTS  THE
PORTFOLIO  TO  TAKE ADVANTAGE OF THESE CHANGES, AND FREQUENTLY  IN
ANTICIPATION OF THEM.

IN THE REPORT THAT FOLLOWS, JEANNE REVIEWS THE FUND'S PERFORMANCE
DURING THE FIRST HALF OF THE FISCAL YEAR, THE SIX MONTHS ENDED
FEBRUARY 28, 1995, AND LOOKS AT PROSPECTS FOR THE MONTHS AHEAD.

RESPECTFULLY YOURS,

[SIGNATURE]

GEORGE PUTNAM
CHAIRMAN OF THE TRUSTEES
APRIL 19, 1995

<PAGE>
REPORT FROM THE FUND MANAGER
JEANNE MOCKARD

Putnam Natural Resources Fund has endured rough seas over the past
two  years, but performance for the six months ended February  28,
1995,  demonstrates the potential for much smoother sailing ahead.
Your   fund's  performance  over  the  semiannual  period,  though
slightly  negative [-0.50% at net asset value (NAV)  for  class  A
shares], reflects considerable improvement over the end of  fiscal
1994.  In fact, for the first two months of 1995, the fund's class
A  shares were up 4.34% at NAV, signaling recovery at a more rapid
pace  for both portfolio holdings and the markets in general. (The
fund also offers class B shares.)

STRATEGY: SHORT-TERM TRADES CONSISTENT WITH LONG-TERM PHILOSOPHY

At the start of the period, the fund held about 40% of its assets
in oil and gas stocks, with oil stocks in the majority. This
allocation reflected our expectation that, over the long term, the
oil industry would benefit from the maturing economic cycle in the
United States and the gradual economic recovery in Europe and the
rest of the world.

In  January, however, we shifted the fund's allocation of gas  and
oil  stocks to favor natural gas. This move was intended  to  take
advantage   of  what  we  judged  to  be  an  attractive   trading
opportunity. Gas prices, reacting to one of the warmest winters on
record,  had  declined, and we saw an opportunity to  acquire  gas
stocks  at excellent valuations. Our long-term view of this sector
has always been positive. Though gas is difficult to transport and
generally  serves a more local market than oil, it  is  clean  and
safe,  as well as abundant. For these reasons, gas has often  been
the  fuel of preference. However, we delayed increasing the fund's
gas holdings until declining prices made the stocks a good value.

We have also tended to favor gas companies whose business includes
oil-related products and enterprises. One recent addition  to  the
portfolio  is  Anadarko Petroleum, a natural  gas  and  crude  oil
company with an emphasis on expanding the
<PAGE>
long-term  growth  potential of natural gas. Last  year,  Anadarko
traded  as high as $58 a share. However, the fund's holdings  were
acquired  at less than $38 per share and we have already seen  the
stock move up somewhat.

TAKING  ADVANTAGE  OF  FAST-MOVING MARKETS IN  RAILS,  PAPER,  AND
CHEMICALS

In  December 1994, we increased the fund's allocation of  railroad
stocks from about 5% to about 9% of the total portfolio. This move
paid  off  nicely when these stocks rallied in January  and  early
February. Shortly after the end of this semiannual period, we took
profits and returned the sector to 5% of assets.

Increased  demand  for all paper grades during the  U.S.  economic
expansion has affirmed the value of our decision to invest heavily
in  paper  stocks. The fund's holdings in Scott Paper,  a  leading
worldwide  producer of tissues, paper towels, napkins,  and  other
paper and printing products, had gained 74% in value when we  sold
these  shares early this year. Chemical stocks also had  a  strong
run  --  first up, then down, and back up again. Though the fund's
gains were not as dramatic as those in paper, we were able to take
substantial profits in this sector as well.

Precious  metals, especially gold, are an important  area  of  the
natural   resources  sector,  but  have  not  been   significantly
represented in your fund's portfolio for some time. This

[BAR CHART]

TOP INDUSTRY SECTORS (2/28/95)
- ------------------------------------------------------------------
- --
Oil & gas                44.5%
Metals & mining          13.7%
Railroads                 9.2%
Chemicals                 7.7%
Forest products
(including paper)         5.9%

[FN]
Based on a percentage of net assets.
[/FN]
<PAGE>
conservative outlook has served the fund well throughout  calendar
1994,  since  performance of precious metals stocks has  not  been
particularly  strong. However, valuations in this sector  are  now
attracting  our attention, and we may be increasing holdings  over
the remainder of fiscal 1995.

A CYCLICAL FUND AND THE IMPACT OF RISING INTEREST RATES

Historically, interest-rate increases have not affected this  fund
to  the  same  extent  that they do bond funds.  However,  if  the
Federal  Reserve  Board  succeeds  in  significantly  slowing  the
economy, Putnam Management expects cyclical stocks to lose ground,
especially   those  that  have  enjoyed  substantial  gains.   The
defensive strategies we have already put in place are intended  to
minimize  the  impact  of  such a change,  should  it  occur.  For
example, we correctly anticipated a slowdown in paper and chemical
stocks  resulting from a rise in inventories and sold  the  fund's
most cyclically sensitive holdings in these sectors.

Your fund will always be cyclical in nature; in the main, it holds
shares   of   commodity-based  companies  whose  prices  fluctuate
according  to  changes  in demand. However, in  another  defensive
move, we are shifting our emphasis away from companies whose value
is  based solely on a single commodity. In the chemical sector, we
are  targeting  companies  that buy  chemicals  for  manufacturing
another  product and thus benefit from lower commodity prices.  In
the  oil  sector,  holdings  favor higher-yielding  securities  of
integrated  companies like Exxon and Royal Dutch Petroleum,  whose
stock  prices  reflect  results in a  variety  of  operations  and
products. The fund's most recently acquired oil service stocks are
those  of companies that have slashed costs and have the potential
to make a profit in a period of slower activity.

BASIC VALUE: AN OVERRIDING PRINCIPLE FOR ALL SECTORS AND CLIMATES

As  the  Republican  majority  has taken  hold  in  Congress,  the
political  landscape has changed dramatically.  The  Congressional
approach to environmental issues is now

<PAGE>
TOP 10 HOLDINGS (2/28/95)
<TABLE>
<S>                                                         <C>
- ------------------------------------------------------------------
- --
ROYAL DUTCH PETROLEUM CO. ADR                             3.2%
- ------------------------------------------------------------------
- --
EXXON CORP                                                 2.7
- ------------------------------------------------------------------
- --
IMPERIAL OIL LTD.                                          2.4
- ------------------------------------------------------------------
- --
UNION PACIFIC CORP.                                        2.2
- ------------------------------------------------------------------
- --
CHEVRON CORP.                                              2.2
- ------------------------------------------------------------------
- --
ATLANTIC RICHFIELD CO.                                     2.2
- ------------------------------------------------------------------
- --
ILLINOIS CENTRAL CORP.                                     2.2
- ------------------------------------------------------------------
- --
ANADARKO PETROLEUM CORP.                                   2.2
- ------------------------------------------------------------------
- --
SCHLUMBERGER LTD.                                          2.1
- ------------------------------------------------------------------
- --
UNION CARBIDE CORP.                                        2.0
- ------------------------------------------------------------------
- --
<FN>
These holdings represent 23.4% of net assets. Portfolio holdings
will vary over time.
</TABLE>

expected to be less stringent, compared with the orientation  that
has  prevailed over the past few years. This could have a positive
effect on the sectors in which your fund invests.

The  dollar's  recent decline may prompt the  Fed  to  resume  its
program  of interest-rate increases; a slower economy, possibly  a
downturn,  could  result  in lower commodity  prices  and  a  more
difficult investment environment.

These are but some of the many factors that can play a part in the
fund's investment strategy. Individual stocks, however, are chosen
in  part  for their consistency with Putnam's philosophy of  basic
value.  We  look beyond the commodity component of  a  company  in
order  to  assess its potential for the kind of successful  change
that  will result in outstanding capital appreciation. This  basic
value  philosophy  has  helped us build  solid  performance  in  a
variety of markets and we expect that it will continue to work  in
your fund's favor.

[FN]
The   views  expressed  here  are  exclusively  those  of   Putnam
Management. They are not meant as investment advice. Although  the
described holdings were viewed favorably as of February 28,  1995,
there  is  no  guarantee  the fund will  continue  to  hold  these
securities in the future.
[/FN]
<PAGE>
PERFORMANCE SUMMARY

This  section provides, at a glance, information about your fund's
performance. Total return shows how the value of the fund's shares
changed over time, assuming you held the shares through the entire
period  and  reinvested all distributions back into the  fund.  We
show total return in two ways: on a cumulative long-term basis and
on  average  how the fund might have grown each year over  varying
periods.  For comparative purposes, we show how the fund performed
relative to appropriate indexes and benchmarks.

TOTAL RETURN FOR PERIODS ENDED 2/28/95

<TABLE><CAPTION>
<S>              <C>     <C>     <C>      <C>        <C>      <C>
                                              STANDARD &
                  CLASS A          CLASS B    POOR'S 500
                 NAV     POP     NAV     CDSC      INDEX     CPI
- ------------------------------------------------------------------
- -
6 months      -0.50%  -6.23%  -0.84%   -5.73%      3.96%    1.28%
- ------------------------------------------------------------------
- -
1 year          2.13   -3.77    1.30    -3.69       7.35     2.86
- ------------------------------------------------------------------
- -
5 years        27.47   20.17      --       --      71.08    17.89
Annual average  4.97    3.74      --       --      11.34     3.35
- ------------------------------------------------------------------
- -
10 years      132.34  118.89      --       --     274.18    42.36
Annual average  8.80    8.15      --       --      14.11     3.59
- ------------------------------------------------------------------
- -
Life of class B   --      --   -1.71    -5.59       4.44     3.22
Annual average    --      --   -1.59    -5.19       4.12     2.97
- ------------------------------------------------------------------
- -
</TABLE>

TOTAL RETURN FOR PERIODS ENDED 3/31/95
(most recent calendar quarter)

<TABLE><CAPTION>
<S>                           <C>       <C>       <C>       <C>
                                 CLASS A            CLASS B
                              NAV       POP       NAV     CDSC
- ------------------------------------------------------------------
- -
1 year                     14.52%     7.96%    13.71%     8.71%
- ------------------------------------------------------------------
- -
5 years                     31.29     23.72        --        --
Annual average               5.60      4.35        --        --
- ------------------------------------------------------------------
- -
10 years                   133.85    120.39        --        --
Annual average               8.87      8.22        --        --
- ------------------------------------------------------------------
- -
Life of class B                --        --      2.47     -1.53
Annual average                 --        --      2.11     -1.31
- ------------------------------------------------------------------
- -
<FN>
Fund performance data do not take into account any adjustment  for
taxes  payable on reinvested distributions or, for class A shares,
distribution  fees  prior  to  implementation  of  the   class   A
distribution  plan  in  1990. Effective  2/1/94,  the  fund  began
offering  class B shares. Performance data represent past  results
and  will differ for each share class. Investment returns and  net
asset value will fluctuate so an investor's shares, when sold, may
be  worth  more or less than their original cost. Past performance
is no assurance of future results.
</TABLE>
<PAGE>
TERMS AND DEFINITIONS

CLASS A SHARES are generally subject to an initial sales charge.

CLASS B SHARES may be subject to a sales charge upon redemption.

NET  ASSET  VALUE  (NAV) is the value of all your  fund's  assets,
minus  any  liabilities,  divided by  the  number  of  outstanding
shares,  not  including any initial or contingent  deferred  sales
charge.

PUBLIC  OFFERING PRICE (POP) is the price of a mutual  fund  share
plus the maximum sales charge levied at the time of purchase.  POP
performance  figures  shown here assume the  maximum  5.75%  sales
charge for class A shares.

CONTINGENT DEFERRED SALES CHARGE (CDSC) is a charge applied at the
time of the redemption of class B shares and assumes redemption at
the end of the period. Your fund's CDSC declines from a 5% maximum
during the first year to 1% during the sixth year. After the sixth
year, the CDSC no longer applies.

COMPARATIVE BENCHMARKS

STANDARD  &  POOR'S(R) 500 INDEX is an unmanaged  list  of  common
stocks  that  is  frequently used as a general  measure  of  stock
market   performance.  The  index  assumes  reinvestment  of   all
distributions and does not take into account brokerage commissions
or  other costs. The fund's portfolio contains securities that  do
not match those in the index.

CONSUMER  PRICE INDEX is a commonly used measure of inflation;  it
does not represent an investment return.

<PAGE>
A PUTNAM PERSPECTIVE ON RISK AND REWARD

You've  probably been told how important it is to  understand  the
relationship  between an investment's potential  rewards  and  its
accompanying   risks.  Given  the  cautionary   nature   of   such
instructions, it may take most investors a while to  realize  that
risk has a positive side.

EVERY  RISK  SIGNALS  A  POTENTIAL REWARD.  Selecting  only  those
investments  that offer the greatest degree of security  generally
leads  to  only  modest  rewards.  Furthermore,  even  insured  or
guaranteed investments may be subject to changes in their rates of
return  or,  in some cases, in their principal values. Experienced
investors  know  that no investment is truly  risk  free  and  are
therefore  willing to take on some measure of  risk  in  order  to
increase their potential gains.

THE GREATER THE RISK, THE GREATER THE POTENTIAL REWARD.  Accepting
an  appropriate  level of investment risk can give  you  a  better
chance  of  outpacing inflation over time and seeking to  maximize
your  investment's return. How much risk? Your financial advisor's
feedback  and  your  time horizon can make all the  difference  in
determining how much risk is compatible with your investment goals
and your peace of mind.

FITTING YOUR FUND SELECTION TO YOUR RISK TOLERANCE

How  do  you find the right balance between investment  risks  and
their  potential rewards? It's helpful to understand the types  of
risks  that  can apply to different types of investments,  and  to
look at your own portfolio with this perspective.

For  short-term goals, your first priority may be managing  market
risk.  Longer-term investors may be more concerned with  inflation
risk.  And all income-oriented investors should consider interest-
rate,  credit,  and  prepayment risks carefully.  Within  each  of
Putnam's  four  investment categories, you can select  funds  with
differing  levels of risk and reward potential to  customize  your
portfolio.

A RUNDOWN OF RISK TYPES

MARKET  RISK  Most important for stock funds, but relevant to  all
funds, this is a measure of how sensitive a fundOs holdings are to
changes  in  general  market conditions.  Remember,  though,  that
securities  that  lose value quickly in market declines  may  also
show the strongest gains in more favorable environments.

INTEREST-RATE RISK  Since bond prices fall as interest rates rise,
this  type  of  risk  is  a  particular concern  for  fixed-income
investors.   However,  interest-rate increases  can  also  have  a
substantial negative effect on the stock market.

INFLATION  RISK   If  your  investments  cannot  keep  pace   with
inflation,  your  money will begin to lose its  purchasing  power.
Stock investments are generally considered among the best ways  of
addressing inflation risk over the long term.

CREDIT  AND PREPAYMENT RISK  Credit risk is the concern  that  the
securityOs  issuer  will not be able to meet  its  payment,  while
prepayment  risk involves the premature payoff of a loan,  with  a
resulting loss of interest income. Professional management and in-
depth research are invaluable in managing both these risks.

LIQUIDITY RISK  Not all investments can be readily converted  into
cash  at their perceived market values. Liquidity risk can  affect
the  price  of securities held in the fundOs portfolio and,  thus,
the fundOs share prices.

This  list  covers only the most general types of risks;  however,
each  investment will also have its own specific risks.  You  will
find  a  more detailed discussion of these risk considerations  in
each fundOs prospectus.
<PAGE>
PUTNAM FAMILY OF FUNDS

PUTNAM GROWTH FUNDS

Asia Pacific Growth Fund
Capital Appreciation Fund
Diversified Equity Trust
Europe Growth Fund
Global Growth Fund
Health Sciences Trust
Investors Fund
Natural Resources Fund*
New Opportunities Fund
OTC Emerging Growth Fund
Overseas Growth Fund
Vista Fund
Voyager Fund

PUTNAM GROWTH AND INCOME FUNDS

Convertible Income-Growth Trust
Dividend Growth Fund
Equity Income Fund
The George Putnam Fund of Boston
The Putnam Fund for Growth and Income
Managed Income Trust
Utilities Growth and Income Fund

PUTNAM INCOME FUNDS

Adjustable Rate U.S. Government Fund
American Government Income Fund
Balanced Government Fund
Corporate Asset Trust
Diversified Income Trust
Federal Income Trust
Global Government Income Trust
High Yield Advantage Fund
High Yield Trust
Income Fund
U.S. Government Income Trust

PUTNAM TAX-FREE INCOME FUNDS

Intermediate Tax Exempt Fund
Municipal Income Fund
Tax Exempt Income Fund
Tax-Free High Yield Fund
Tax-Free Insured Fund

STATE TAX-FREE INCOME FUNDS(+)
Arizona, California, Florida, Massachusetts, Michigan, Minnesota,
New Jersey, New York, Ohio and Pennsylvania

LIFESTAGE(SM) FUNDS

Putnam Asset Allocation Funds -- three investment portfolios that
spread your money across a variety of stocks, bonds, and money
market investments to help maximize your return and reduce your
risk.

THE THREE PORTFOLIOS:

Putnam Asset Allocation: Balanced Portfolio
Putnam Asset Allocation: Conservative Portfolio
Putnam Asset Allocation: Growth Portfolio

MOST CONSERVATIVE INVESTMENTS(++)

PUTNAM MONEY MARKET FUNDS
Money Market Fund(SS)
California Tax Exempt Money Market Fund
New York Tax Exempt Money Market Fund
Tax Exempt Money Market Fund

CDS AND SAVINGS ACCOUNTS**

*    Formerly Energy-Resources Trust
+    Not available in all states.
++   Relative to above.
(SS) Formerly Daily Dividend Trust
**   Not  offered by Putnam Investments. Certificates  of  deposit
     offer  a  fixed  rate of return and may  be  insured,  up  to
     certain  limits, by federal/state agencies. Savings  accounts
     may also be insured up to certain limits.

Please  call  your  financial  advisor  or  Putnam  to  obtain   a
prospectus  for  any  Putnam  fund.  It  contains  more   complete
information,  including charges and expenses.  Read  it  carefully
before you invest or send money.

<PAGE>
PORTFOLIO OF INVESTMENTS OWNED
February 28, 1995 (Unaudited)

<TABLE><CAPTION>
<C>          <S>                                           <C>
COMMON STOCKS (91.8%)*
NUMBER OF SHARES                                          VALUE

ALUMINUM (2.7%)
- ------------------------------------------------------------------
- --
             64,000                    Aluminum Co. of America$
             2,496,000
             24,000                         Reynolds Metal Co.
             1,200,000
                                                              ---
             ---------

3,696,000
BASIC INDUSTRIAL PRODUCTS (0.4%)
- ------------------------------------------------------------------
- --
             12,000                      Parker-Hannifin Corp.
             561,000

CHEMICALS (7.7%)
- ------------------------------------------------------------------
- --
             19,000                           Dow Chemical Co.
             1,273,000
             20,000                       Eastman Chemical Co.
             1,095,000
             41,000                         Grace (W.R.) & Co.
             1,845,000
             21,000                            Rohm & Haas Co.
             1,178,625
             96,000                        Union Carbide Corp.
             2,748,000
             42,000                       Witco Chemical Corp.
             1,202,250
             19,000      du Pont (E.I.) de Nemours & Co., Ltd.
             1,066,375
                                                              ---
             ---------

10,408,250
COAL (0.7%)
- ------------------------------------------------------------------
- --
             30,000                    Pittston Minerals Group
             622,500
             33,000                   Zeigler Coal Holding Co.
             354,750
                                                              ---
             ---------

977,250
COMBINED UTILITIES (1.0%)
- ------------------------------------------------------------------
- --
             55,000                        Pacific Enterprises
             1,347,500

COMPUTERS (0.6%)
- ------------------------------------------------------------------
- --
             11,000                                  IBM Corp.
             827,750

CONGLOMERATES (1.5%)
- ------------------------------------------------------------------
- --
             45,000                              Tenneco, Inc.
             2,047,500

CONSTRUCTION (0.5%)
- ------------------------------------------------------------------
- --
             14,000                       Foster Wheeler Corp.
             458,500
             21,000                     Morrison Knudsen Corp.
             162,750
                                                              ---
             ---------

621,250
FARM EQUIPMENT (1.0%)
- ------------------------------------------------------------------
- --
             18,000                         Deere (John) & Co.
             1,379,250

FINANCE (0.7%)
- ------------------------------------------------------------------
- --
             15,000                  Morgan (J.P.) & Co., Inc.
             967,500

GAS PIPELINES (5.0%)
- ------------------------------------------------------------------
- --
             33,000               El Paso Natural Gas Co.
             1,014,750
             30,000                                Enron Corp.
             990,000
             85,400                   Panhandle Eastern Corp.
             1,921,500
             82,000                          Sonat, Inc.
             2,378,000
             16,100                        Williams Cos., Inc.
             462,875
                                                              ---
             ---------

6,767,125
GAS UTILITIES (0.6%)
- ------------------------------------------------------------------
- --
             20,000          Consolidated Natural Gas Co.
             740,000

INSURANCE (0.5%)
- ------------------------------------------------------------------
- --
             13,000                 Aetna Life & Casualty Co.
             698,750

MACHINERY (0.6%)
- ------------------------------------------------------------------
- --
             29,000          Harnischfeger Industries, Inc.
             808,375

METALS AND MINING (6.5%)
- ------------------------------------------------------------------
- --
             37,000                        Barrick Gold Corp.
             804,750
             40,000                   Cyprus Amax Minerals Co.
             1,080,000
             50,000                 Euro Nevada Mining Corp.
             975,020
             91,374  Freeport-McMoRan Copper & Gold Co., Inc.
             Class A                                 1,918,865
             55,000                 Freeport-McMoRan, Inc.
             990,000
             90,000                          INDRESCO, Inc.+
             1,113,750
             73,000                          Placer Dome Inc.
             1,487,375
             45,000          Santa Fe Pacific Gold Corp.
             489,375
                                                              ---
             ---------

8,859,135
OIL SERVICES (6.5%)
- ------------------------------------------------------------------
- --
             36,600                        BJ Services Co.+
             681,675
             70,000                          Baker Hughes Inc.
             1,347,500
             30,000                 Coflexip Engineers ADR
             757,500
             62,000                   Dresser Industries, Inc.
             1,278,750
             65,700            McDermott International, Inc.
             1,839,600
             50,000                          Schlumberger Ltd.
             2,843,750
                                                              ---
             ---------

8,748,775
OIL AND GAS (36.9%)
- ------------------------------------------------------------------
- --
             41,000                                Amoco Corp.
             2,429,250
             67,000                   Anadarko Petroleum Corp.
             2,939,625
             27,000                   Atlantic Richfield Co.
             2,959,875
             26,828            British Petroleum Co., PLC ADR
             2,052,412
             58,000            Burlington Resources Inc.
             2,233,000
             63,000                          Chevron Corp.
             2,992,500
             88,000                   Diamond Shamrock Inc.
             2,200,000
             57,000                          Exxon Corp.
             3,648,000
             96,900                          Imperial Oil Ltd.
             3,294,600
             19,000                        Kerr-McGee Corp.
             957,125
             63,000     Louisiana Land & Exploration Co.
             2,181,375
             70,000            Occidental Petroleum Corp.
             1,391,250
             50,000                          Pennzoil Co.
             2,368,750
             81,000                   Phillips Petroleum Co.
             2,703,375
             39,000            Royal Dutch Petroleum Co. ADR
             4,372,875
             32,651            Santa Fe Southern Pacific Corp.
             693,834
             40,000                              Sun, Co. Inc.
             1,165,000
             32,000                                Texaco Inc.
             2,040,000
             20,000                            Total Corp. ADS
             555,000
             125,000                   USX-Marathon Group Inc.
             2,031,250
             300,000                    Ulster Petroleum Ltd.+
             916,620
             100,000                            Ultramar Corp.
             2,575,000
             35,000         Union Texas Petroleum Hldgs., Inc.
             673,750
             20,000                               Unocal Corp.
             567,500
                                                              ---
             ---------

49,941,966
PAPER/FOREST PRODUCTS(5.9%)
- ------------------------------------------------------------------
- --
             13,000                    International Paper Co.
             992,875
             10,000                       Kimberly-Clark Corp.
             520,000
             52,000                             Potlatch Corp.
             2,242,500
             13,000                        Temple Inland, Inc.
             635,375
             18,000                        Union Camp Corp.
             927,000
             45,000                          Weyerhaeuser Co.
             1,833,750
             14,000                Willamette Industries, Inc.
             752,500
                                                              ---
             ---------

7,904,000
PHOTOGRAPHY (0.9%)
- ------------------------------------------------------------------
- --
             23,000                          Eastman Kodak Co.
             1,173,000

RAILROADS (7.8%)
- ------------------------------------------------------------------
- --
             10,000                               CSX Corp.
             777,500
             30,000   Chicago & North Western Holdings Corp.+
             750,000
             14,000                               Conrail Inc.
             773,500
             87,000                   Illinois Central Corp.
             2,947,124
             20,000                   Norfolk Southern Corp.
             1,322,500
             55,000          Southern Pacific Rail Corp.+
             983,125
             58,000                   Union Pacific Corp.
             3,030,500
                                                              ---
             ---------

10,584,249
STEEL (3.8%)
- ------------------------------------------------------------------
- --
             21,000            Carpenter Technology Corp.
             1,139,250
             35,000            Inland Steel Industries, Inc.+
             1,006,250
             20,000                          Nucor Corp.
             1,122,500
             31,000                   USX-U.S. Steel Group
             1,030,750
             117,000                Weirton Steel Corp.+
             892,125
- ------------------------------------------------------------------
             --

5,190,875
- ------------------------------------------------------------------
             --
                       TOTAL COMMON STOCKS (cost $123,111,219)
             $124,249,500
- ------------------------------------------------------------------
- --
</TABLE>
<PAGE>
CONVERTIBLE PREFERRED STOCKS (2.7%)*
NUMBER OF SHARES                                          VALUE

<TABLE><CAPTION>
<C>       <S>                                               <C>
OIL AND GAS (0.6%)
- ------------------------------------------------------------------
- --
             36,364     Atlantic Ritchfield Co. $2.23 cv. pfd.
             $890,918

OILS (0.7%)
- ------------------------------------------------------------------
             --
             17,000              Ashland, Inc. $3.125 cv. pfd.
             913,750

RAILROADS (1.4%)
- ------------------------------------------------------------------
             --
             30,000                 Burlington Northern, Inc.
             Ser. A, $3.125, cum. cv. pfd.        $  1,860,000
- ------------------------------------------------------------------
             --
                           TOTAL CONVERTIBLE PREFERRED STOCKS
             (cost $3,557,265)                      $3,664,668
- ------------------------------------------------------------------
- --
</TABLE>

CONVERTIBLE BONDS AND NOTES (1.2%)*
PRINCIPAL AMOUNT                                          VALUE
- ------------------------------------------------------------------
- --

<TABLE><CAPTION>
<C>         <S>                                             <C>
OIL AND GAS (0.7%)
- ------------------------------------------------------------------
- --
             $1,000,000               Pogo Producing Co. sub.
             notes 5 1/2s, 2004                       $983,750

TOBACCO (0.5%)
- ------------------------------------------------------------------
             --
             1,000,000              Standard Commercial Corp.
             cv. sub. deb. 7 1/4s, 2007                701,250
- ------------------------------------------------------------------
             --
                            TOTAL CONVERTIBLE BONDS AND NOTES
             (cost $1,626,375)                      $1,685,000
- ------------------------------------------------------------------
- --

EUROBONDS (0.6%)* (cost $800,000)
PRINCIPAL AMOUNT                                          VALUE
- ------------------------------------------------------------------
- --
             $800,000 APACHE CORP. 144A CV. SUB. DEB. 6S, 2002
             $832,000
- ------------------------------------------------------------------
- --

SHORT-TERM INVESTMENTS (3.4%)* (cost $4,530,000)
PRINCIPAL AMOUNT VALUE
- ------------------------------------------------------------------
- --
             $4,530,000      Federal Home Loan Mortgage Corp.
             5.95s, March 1, 1995                 $  4,530,000
- ------------------------------------------------------------------
             --
                                            TOTAL INVESTMENTS
             (cost $133,624,859)***               $134,961,168
- ------------------------------------------------------------------
- --
<FN>
*   Percentages  indicated are based on net assets of $135,365,376
    which correspond to a net asset value per share of class A and
    class B shareholders of $14.41 and 14.32, respectively.

+   Non-income-producing security.

*** The  aggregate  identified  cost  on  a  tax  cost  basis   is
    $133,837,163  resulting in gross unrealized  appreciation  and
    depreciation of $7,805,783 and $6,681,778 respectively, or net
    unrealized appreciation of $1,124,005.

    ADR  or  ADS  after the name of a foreign holding  stands  for
    American  Depository  Receipt or American  Depository  Shares,
    respectively, representing ownership of foreign securities  on
    deposit with a domestic custodian bank.

    144A after the name of a security represents those exempt from
    registration  under Rule 144A of the Securities Act  of  1933.
    These  securities  may be resold in transactions  exempt  from
    registration, normally to qualified institutional buyers.

<PAGE>
STATEMENT OF ASSETS AND LIABILITIES
February 28, 1995 (Unaudited)


</TABLE>
<TABLE><CAPTION>
<S>                                                         <C>
ASSETS
- ------------------------------------------------------------------
- --
Investments in securities, at value
(identified cost $133,624,859) (Note 1)            $134,961,168
- ------------------------------------------------------------------
- --
Cash                                                      1,137
- ------------------------------------------------------------------
- --
Dividends, interest and other receivables               698,910
- ------------------------------------------------------------------
- --
Receivable for shares of the fund sold                  282,104
- ------------------------------------------------------------------
- --
TOTAL ASSETS                                       $135,943,319
- ------------------------------------------------------------------
- --
LIABILITIES
- ------------------------------------------------------------------
- --
Payable for shares of the fund repurchased         $    211,883
- ------------------------------------------------------------------
- --
Payable for compensation of Manager (Note 2)            227,664
- ------------------------------------------------------------------
- --
Payable for investor servicing and
custodian fees (Note 2)                                  42,991
- ------------------------------------------------------------------
- --
Payable for compensation of Trustees (Note 2)               328
- ------------------------------------------------------------------
- --
Payable for administrative services (Note 2)              1,312
- ------------------------------------------------------------------
- --
Payable for distribution fees (Note 2)                   58,726
- ------------------------------------------------------------------
- --
Other accrued expenses                                   35,039
- ------------------------------------------------------------------
- --
TOTAL LIABILITIES                                       577,943
- ------------------------------------------------------------------
- --
NET ASSETS                                         $135,365,376
- ------------------------------------------------------------------
- --
REPRESENTED BY
- ------------------------------------------------------------------
- --
Paid-in capital (Note 4)                          $137,183,580
- ------------------------------------------------------------------
- --
Undistributed net investment income                    560,852
- ------------------------------------------------------------------
- --
Accumulated net realized loss on
investment transactions                            (3,715,365)
- ------------------------------------------------------------------
- --
Net unrealized appreciation of investments            1,336,309
- ------------------------------------------------------------------
- --
TOTAL -- REPRESENTING NET ASSETS APPLICABLE
TO CAPITAL SHARES  OUTSTANDING                      135,365,376
- ------------------------------------------------------------------
- --
COMPUTATION OF NET ASSET VALUE AND OFFERING PRICE
- ------------------------------------------------------------------
- --
Net asset value and redemption price per
class A share ($119,941,165 divided by 8,324,208 shares) $14.41
- ------------------------------------------------------------------
- --
Offering price per share (100/94.25 of $14.41)*          $15.29
- ------------------------------------------------------------------
- --
Net asset value and offering price per class B share
($15,424,211  divided by 1,076,898)**                    $14.32
- ------------------------------------------------------------------
- --
<FN>
*   On  single  retail  sales of less than $50,000.  On  sales  of
    $50,000  or  more  and on group sales the  offering  price  is
    reduced.
**  Redemption  price per share is equal to net asset  value  less
    any applicable contingent deferred sales charge.
<PAGE>
STATEMENT OF OPERATIONS
Six months ended February 28, 1995 (Unaudited)

</TABLE>
<TABLE>
<S>                                                         <C>
INVESTMENT INCOME:
- ------------------------------------------------------------------
- --
Dividends (net of foreign tax of $11,160)           $ 1,934,693
- ------------------------------------------------------------------
- --
Interest                                                 63,528
- ------------------------------------------------------------------
- --
TOTAL INVESTMENT INCOME                               1,998,221
- ------------------------------------------------------------------
- --
EXPENSES:
- ------------------------------------------------------------------
- --
Compensation of Manager (Note 2)                    $   470,269
- ------------------------------------------------------------------
- --
Investor servicing and custodian fees (Note 2)           45,055
- ------------------------------------------------------------------
- --
Compensation of Trustees (Note 2)                         6,451
- ------------------------------------------------------------------
- --
Reports to shareholders                                  38,766
- ------------------------------------------------------------------
- --
Auditing                                                 13,505
- ------------------------------------------------------------------
- --
Legal                                                     5,344
- ------------------------------------------------------------------
- --
Postage                                                  12,430
- ------------------------------------------------------------------
- --
Administrative services (Note 2)                          3,692
- ------------------------------------------------------------------
- --
Distribution fees (Note 2)
- ------------------------------------------------------------------
- --
 Class A                                                126,481
- ------------------------------------------------------------------
- --
 Class B                                                 65,896
- ------------------------------------------------------------------
- --
Other expenses                                           10,003
- ------------------------------------------------------------------
- --
TOTAL EXPENSES                                          797,892
- ------------------------------------------------------------------
- --
NET INVESTMENT INCOME                                 1,200,329
- ------------------------------------------------------------------
- --
Net realized gain on investments (Notes 1 and 3)      1,836,130
- ------------------------------------------------------------------
- --
Net unrealized depreciation of investments
during the year                                     (4,204,732)
- ------------------------------------------------------------------
- --
NET LOSS ON INVESTMENTS                             (2,368,602)
- ------------------------------------------------------------------
- --
NET DECREASE IN NET ASSETS RESULTING
FROM OPERATIONS                                    $(1,168,273)
- ------------------------------------------------------------------
- --
</TABLE>
<PAGE>
STATEMENT OF CHANGES IN NET ASSETS

<TABLE><CAPTION>
<S>                                            <C>          <C>
                                        SIX MONTHS
                                             ENDED   YEAR ENDED
                                       FEBRUARY 28    AUGUST 31
                                      ------------   ----------
                                             1995*         1994
- ------------------------------------------------------------------
- --
INCREASE (DECREASE) IN NET ASSETS
- ------------------------------------------------------------------
- --
Operations:
- ------------------------------------------------------------------
- --
Net investment income                 $  1,200,329 $  1,566,736
- ------------------------------------------------------------------
- --
Net realized gain (loss)
on investments                           1,836,130  (2,295,993)
- ------------------------------------------------------------------
- --
Net unrealized depreciation
of investments                         (4,204,732) (11,413,778)
- ------------------------------------------------------------------
- --
NET DECREASE IN NET ASSETS RESULTING
FROM OPERATIONS                        (1,168,273)(12,143,035)
- ------------------------------------------------------------------
- --
Distributions to shareholders from:
- ------------------------------------------------------------------
- --
Net investment income:
- ------------------------------------------------------------------
- --
 Class A                               (1,974,101)  (1,197,888)
- ------------------------------------------------------------------
- --
 Class B                                 (195,433)           --
- ------------------------------------------------------------------
- --
Net realized gain on
investments -- Class A                          -- (18,784,262)
- ------------------------------------------------------------------
- --
In excess of net realized gain on investments
- ------------------------------------------------------------------
- --
 Class A                                        --  (3,255,502)
- ------------------------------------------------------------------
- --
Increase (decrease) from capital
share transactions  (Note 4)             (990,214)   41,489,102
- ------------------------------------------------------------------
- --
INCREASE (DECREASE) IN NET ASSETS      (4,328,021)    6,108,415
- ------------------------------------------------------------------
- --
NET ASSETS
- ------------------------------------------------------------------
- --
Beginning of period                    139,693,397  133,584,982
- ------------------------------------------------------------------
- --
END OF PERIOD (including undistributed
net investment  income of $560,852 and
$1,530,057, respectively)             $135,365,376 $139,693,397
- ------------------------------------------------------------------
- --
<FN>
*    Unaudited
</TABLE>
<PAGE>
FINANCIAL HIGHLIGHTS
(For a share outstanding throughout the period)
<TABLE><CAPTION>
<S>              <C>            <C>          <C>     <C>      <C>     <C>
                        FEBRUARY 1,
                               1994
          SIX MONTHS  (COMMENCEMENT   SIX MONTHS
               ENDED OF OPERATIONS)        ENDED
         FEBRUARY 28   TO AUGUST 31  FEBRUARY 28
- ---------------------------------------------------------------------------
- --
              1995**          1994*       1995**    1994     1993    1992
- ---------------------------------------------------------------------------
- --
                      CLASS B                        CLASS A
- ---------------------------------------------------------------------------
- --
NET ASSET VALUE,
BEGINNING OF
PERIOD        $14.65         $14.78       $14.73 $20.51   $17.57   $17.74
- ---------------------------------------------------------------------------
- --
INVESTMENT
OPERATIONS
Net investment
income           .06            .13          .14     .19      .23     .35
Net realized
and unrealized
(loss) on
investments    (.19)          (.26)        (.22)  (2.37)     3.41     .44
- ---------------------------------------------------------------------------
- --
TOTAL FROM
INVESTMENT
OPERATIONS     (.13)          (.13)        (.08)  (2.18)     3.64     .79
- ---------------------------------------------------------------------------
- --
LESS DISTRIBUTIONS FROM:
Net investment
income         (.20)             --        (.24)   (.19)    (.18)   (.39)
Net realized
gain on
investments       --             --           --  (2.91)    (.52)   (.57)
- ---------------------------------------------------------------------------
- --
In excess of
net realized
gain on
investments       --             --           --   (.50)       --      --
- ---------------------------------------------------------------------------
- --
TOTAL
DISTRIBUTIONS  (.20)             --        (.24)  (3.60)    (.70)   (.96)
- ---------------------------------------------------------------------------
- --
NET ASSET
VALUE, END
OF PERIOD     $14.32         $14.65       $14.41  $14.73   $20.51  $17.57
- ---------------------------------------------------------------------------
- -
TOTAL INVESTMENT
RETURN AT
NET ASSET
VALUE (%)(b)(.84)(c)       (.88)(c)     (.50)(c)  (9.67)    21.79    5.12
- ---------------------------------------------------------------------------
- -
NET ASSETS,
END OF
PERIOD (in
thousands)   $15,424   $10,244  $119,941  $129,449  $133,585  $109,705
- ---------------------------------------------------------------------------
- -
Ratio of
expenses to
average net
assets (%)    .90(c)   1.11(c)    .56(c)      1.24      1.18      1.61
- ---------------------------------------------------------------------------
- -
Ratio of net
investment
income (loss)
to average
net assets (%).59(c)  .90(c)      .92(c)      1.24      1.25      2.13
- ---------------------------------------------------------------------------
- -
Portfolio
turnover (%)22.73(c) 189.83(c)  22.73(c)    189.83    170.54    28.33
- ---------------------------------------------------------------------------
- -
</TABLE>

<PAGE>
FINANCIAL HIGHLIGHTS (CONTINUED)
<TABLE><CAPTION>
       <C>       <C>       <C>       <C>       <C>       <C>       <C>
                                                                  NINE
                                                                MONTHS
                                                                 ENDED
- ---------------------------------------------------------------------------
- -
                    YEAR ENDED AUGUST 31                     AUGUST 31
- ---------------------------------------------------------------------------
- -
      1991      1990      1989      1988      1987      1986      1985
- ---------------------------------------------------------------------------
- -

    $17.94    $17.06    $13.25    $15.55    $11.14    $11.98    $10.61
- ---------------------------------------------------------------------------
- -
       .46       .49       .45    .37(a)    .44(a)       .18    .17(a)

       .59      1.13      3.70    (2.22)      4.44     (.75)      1.55
- ---------------------------------------------------------------------------
- -

      1.05      1.62      4.15    (1.85)      4.88     (.57)      1.72
- ---------------------------------------------------------------------------
- -

     (.52)     (.54)     (.34)     (.41)     (.42)     (.27)     (.35)
     (.73)     (.20)        --     (.04)     (.05)        --        --
- ---------------------------------------------------------------------------
- -

        --        --        --        --        --        --        --
- ---------------------------------------------------------------------------
- -
    (1.25)     (.74)     (.34)     (.45)     (.47)     (.27)     (.35)
- ---------------------------------------------------------------------------
- -

    $17.74    $17.94    $17.06    $13.25    $15.55    $11.14    $11.98
- ---------------------------------------------------------------------------
- -

      6.62      9.72     31.64   (11.67)     44.87    (4.81)  16.70(c)
- ---------------------------------------------------------------------------
- -

  $125,607  $137,669  $116,042  $107,932  $146,755   $34,860   $33,995
- ---------------------------------------------------------------------------
- -

      1.53      1.50      1.40   1.47(a)   1.42(a)      1.771.25(a)(c)
- ---------------------------------------------------------------------------
- -


      2.65      2.82      2.93   2.73(a)   3.46(a)      1.571.28(a)(c)
- ---------------------------------------------------------------------------
- -
     38.03     48.19     60.29     86.04    179.58    216.22 129.59(c)
- ---------------------------------------------------------------------------
- -
<FN>
** Unaudited.
*  Per  share net investment income has been determined on the basis of the
   weighted average number of shares outstanding during the period.
(a)Reflects  expense  limitations applicable during  these  periods.  As  a
   result  of  such limitations, expenses of the fund for the  years  ended
   August  31, 1988 and 1987, the period ended August 31, 1985 reflect  per
   share reductions of $.01, $.03 and $.03, respectively.
(b)Total  investment  return  assumes dividend reinvestment  and  does  not
   reflect the effect of sales charges.
(c)Not annualized.
</TABLE>
<PAGE>
NOTES TO FINANCIAL STATEMENTS
February 28, 1995 (Unaudited)

NOTE 1
SIGNIFICANT ACCOUNTING POLICIES
The  fund is registered under the Investment Company Act of  1940,
as  amended,  as  a  diversified, open-end  management  investment
company.  The  fund  continues  to seek  capital  appreciation  by
investing  primarily  in the common stocks  of  companies  in  the
energy  and  natural resources industries, but may also  invest  a
portion  of  its  assets in other industries and  in  fixed-income
securities.

The  fund  offers both class A and class B shares. Class A  shares
are  sold with a maximum front-end sales charge of 5.75%. Class  B
do  not  pay  a  front-end sales charge, but pay a higher  ongoing
distribution  fee than class A shares, and may  be  subject  to  a
contingent  deferred  sales charge, if those shares  are  redeemed
within  six  years of purchase. In addition, the Trustees  declare
separate  dividends on each class of shares. Expenses of the  fund
are  borne pro-rata by the shareholders of both classes of shares,
except  that  each  class  bears expenses  unique  to  that  class
(including  the distribution fees applicable to such class).  Each
class  votes  only  with respect to its own distribution  plan  or
other  matters  on  which  a class vote  is  required  by  law  or
determined  by  the Trustees. Shares of each class  would  receive
their  pro-rata share of the net assets of the fund, if  the  fund
were liquidated.

The  following  is  a  summary of significant accounting  policies
consistently  followed  by  the fund in  the  preparation  of  its
financial   statements.  The  policies  are  in  conformity   with
generally accepted accounting principles.

A  SECURITY VALUATION  Investments for which market quotations are
readily  available are stated at market value, which is determined
using the last reported sale price, or, if no sales are reported -
- - as in the case of some securities traded over-the-counter -- the
last  reported  bid  price, except that  certain  U.S.  government
obligations  are stated at the mean between the last reported  bid
and  asked  prices.  Market quotations are not  considered  to  be
readily   available   for   some  convertible   securities;   such
investments  are stated at fair value on the basis  of  valuations
furnished  by  a  pricing service approved by the Trustees,  which
determines valuations for normal, institutional-size trading units
of  such securities using methods based on market transactions for
comparable securities and various relationships between securities
which  are  generally recognized by institutional traders.  Short-
term  investments having remaining maturities of 60 days  or  less
are  stated at amortized cost which approximates market, and other
investments are stated at fair value following procedures approved
by  the  Trustees. Foreign securities quoted in foreign currencies
are translated into U.S. dollars at the current exchange rate.

B  JOINT TRADING ACCOUNT  Pursuant to an exemptive order issued by
the  Securities  and Exchange Commission, the  fund  may  transfer
uninvested cash balances into a joint trading account, along  with
the  cash  of  other  registered investment companies  managed  by
Putnam Investment Management, Inc. (Putnam Management), the fund's
investment   manager,   a  wholly-owned   subsidiary   of   Putnam
Investments,  Inc. and certain other accounts. These balances  may
be invested in one or more repurchase agreements and/or short-term
money market instruments.

C   REPURCHASE AGREEMENTS  The fund, or any joint trading account,
through   its  custodian,  receives  delivery  of  the  underlying
securities,  the market value of which at the time of purchase  is
required  to  be in an amount at least equal to the resale  price,
including accrued interest. The fund's Manager is responsible  for
determining  that the value of these underlying securities  is  at
all  times  at least equal to the resale price, including  accrued
interest.

D   SECURITY TRANSACTIONS AND RELATED INVESTMENT INCOME   Security
transactions are accounted for on the trade date (date  the  order
to  buy  or sell is executed). Interest income is recorded on  the
accrual  basis and dividend income is recorded on the  ex-dividend
date,  except  that certain dividends from foreign securities  are
recorded as soon as the fund is informed of the ex-dividend date.

E   FEDERAL TAXES  It is the policy of the fund to distribute  all
of its income within the prescribed time and otherwise comply with
the  provisions  of  the  Internal  Revenue  Code  applicable   to
regulated  investment companies. It is also the intention  of  the
fund to distribute an amount sufficient to avoid imposition of any
excise  tax  under Section 4982 of the Internal  Revenue  Code  of
1986.  Therefore, no provision has been made for federal taxes  on
income,  capital  gains or unrealized appreciation  of  securities
held and excise tax on income and capital gains.

F   DISTRIBUTIONS  TO SHAREHOLDERS  Distributions to  shareholders
are recorded by the fund on the ex- dividend date.

The amount and character of income and gains to be distributed are
determined  in  accordance with income tax regulations  which  may
differ from generally accepted accounting principles

NOTE 2
MANAGEMENT FEE, ADMINISTRATIVE SERVICES, AND OTHER TRANSACTIONS

Compensation  of  Putnam  Management,  the  fund's  Manager,   for
management  and  investment advisory services  is  paid  quarterly
based on the average net assets of the fund for the quarter.  Such
fee  is  based on the following annual rates: 0.70% of  the  first
$500  million  of  average net assets,  0.60%  of  the  next  $500
million,  0.55% of the next $500 million and 0.50% of  any  amount
over $1.5 billion, subject, under current law, to reduction in any
year  to the extent that expenses (exclusive of distribution fees,
brokerage,  interest, taxes and credits allowed by  PFTC)  of  the
fund  exceed 2.5% of the first $30 million of average net  assets,
2.0%  of  the  next $70 million and 1.5% of any amount  over  $100
million,  and  by the amount of certain brokerage commissions  and
fees (less expenses) received by affiliates of the Manager on  the
fund's portfolio transactions.

The  fund  also  reimburses the Manager for the  compensation  and
related  expenses of certain officers of the fund and their  staff
who  provide  administrative services to the fund.  The  aggregate
amount  of all such reimbursements is determined annually  by  the
Trustees.

Trustees  of the fund receive an annual Trustee's fee of $870  and
an  additional  fee for each Trustees' meeting attended.  Trustees
who  are  not interested persons of the Manager and who  serve  on
committees  of the Trustees receive additional fees for attendance
at certain committee meetings.

Custodial  functions for the fund's assets are being  provided  by
Putnam  Fiduciary  Trust Company (PFTC), a  subsidiary  of  Putnam
Investments, Inc. Investor servicing agent functions are  provided
by Putnam Investor Services, a division of PFTC.

Investor servicing and custodian fees reported in the Statement of
operations for the six months ended February 28, 1995,  have  been
reduced by credits allowed by PFTC.

The fund has adopted distribution plans (the "Plans") with respect
to  its  class A shares and class B shares pursuant to Rule  12B-1
under the Investment Company Act of 1940. The purpose of the Plans
is  to  compensate  Putnam  Mutual  Funds  Corp.,  a  wholly-owned
subsidiary of Putnam Investments, Inc., for services provided  and
expenses  incurred by it in distributing shares of the  fund.  The
Trustees  have approved payment by the fund at an annual  rate  of
.25%  and 1.00% of the average net assets attributable to class  A
and class B shares, respectively.

For  the  six months ended February 28, 1995, Putnam Mutual  Funds
Corp.,  acting as underwriter, received net commissions of $21,572
from  the sale of class A shares and $5,852 in contingent deferred
sales charges from redemptions of class B shares. A deferred sales
charge  of up to 1% is assessed on certain redemptions of class  A
shares  purchased as part of an investment of $1 million or  more.
For  the  six months ended February 28, 1995, Putnam Mutual  Funds
Corp.,  acting as underwriter received commissions  of  $1,695  on
such redemptions.

NOTE 3
PURCHASES AND SALES OF SECURITIES

During the six months ended February 28, 1995, purchases and sales
of  investment  securities other than U.S. government  obligations
and short-term investments aggregated $30,145,937 and $29,864,621,
respectively. There were no purchases or sales of U.S.  government
obligations during the year. In determining the net gain  or  loss
on  securities sold, the cost of securities has been determined on
the identified cost basis.


NOTE 4
CAPITAL SHARES

At  February 28, 1995, there was an unlimited number of shares  of
beneficial interest authorized divided into two classes,  class  A
and class B capital stock. Transactions in capital shares were  as
follows:

<TABLE><CAPTION>
<S>                                        <C>              <C>
                                   SIX MONTHS ENDED FEBRUARY 28
- ------------------------------------------------------------------
- --
                                                           1995
- ------------------------------------------------------------------
- --
CLASS A                                 SHARES           AMOUNT
- ------------------------------------------------------------------
- --
Shares sold                          2,055,075     $ 29,468,216
Shares issued in connection with
reinvestment of distributions          122,248       1,684,574
                                     2,177,323       31,152,790
- ------------------------------------------------------------------
- --
Shares repurchased                 (2,641,281)     (37,596,690)
- ------------------------------------------------------------------
- --
NET DECREASE                         (463,958)    $ (6,443,900)
- ------------------------------------------------------------------
- --
                                           YEAR ENDED AUGUST 31
- ------------------------------------------------------------------
- --
                                                           1994
- ------------------------------------------------------------------
- --
CLASS A                                 SHARES           AMOUNT
- ------------------------------------------------------------------
- --
Shares sold                          5,945,322     $ 90,135,849
Shares issued in connection with
reinvestment of distributions        1,449,982       20,229,142
                                     7,395,304      110,364,991
- ------------------------------------------------------------------
- --
Shares repurchased                 (5,118,928)     (78,718,058)
- ------------------------------------------------------------------
- --
NET INCREASE                         2,276,376     $ 31,646,933
- ------------------------------------------------------------------
- --
                                   SIX MONTHS ENDED FEBRUARY 28
- ------------------------------------------------------------------
- --
                                                           1995
- ------------------------------------------------------------------
- --
CLASS B                                 SHARES           AMOUNT
- ------------------------------------------------------------------
- --
Shares sold                            658,584      $ 9,331,339
Shares issued in connection with
reinvestment of distributions           11,890          163,022
- ------------------------------------------------------------------
- --
                                           670,474    9,494,361
- ------------------------------------------------------------------
- --
Shares redeemed                          (292,749) (4,040,675)
- ------------------------------------------------------------------
- --
NET INCREASE                               377,725 $ 5,453,686
- ------------------------------------------------------------------
- --
</TABLE>

<TABLE>
<CAPTION>
<S>                                        <C>              <C>
                                               FEBRUARY 1, 1994
                                                  (COMMENCEMENT
                                              OF OPERATIONS) TO
                                                      AUGUST 31
- ------------------------------------------------------------------
- --
                                                           1994
- ------------------------------------------------------------------
- --
CLASS B                                 SHARES           AMOUNT
- ------------------------------------------------------------------
- --
Shares sold                            787,844      $11,091,198
Shares issued in connection with
reinvestment of distributions         (88,671)      (1,249,029)
- ------------------------------------------------------------------
- --
                                       699,173        9,842,169
- ------------------------------------------------------------------
- --
Shares redeemed                             --               --
- ------------------------------------------------------------------
- --
NET INCREASE                           699,173      $ 9,842,169
- ------------------------------------------------------------------
- --
</TABLE>
<PAGE>
OUR COMMITMENT TO QUALITY SERVICE

CHOOSE AWARD-WINNING SERVICE.

Putnam Investor Services has won the DALBAR Quality Tested Service
Seal for the past five years, through 1994. DALBAR, an independent
research  firm,  ran  more  than 12,000 tests  of  38  shareholder
service  components.  In every category, Putnam  outperformed  the
industry standard.

HELP YOUR INVESTMENT GROW.

Set up a systematic program for investing with as little as $25  a
month  from  a  Putnam  fund  or from  your  checking  or  savings
account.*

SWITCH FUNDS EASILY.

You can move money from one account to another with the same class
of  shares without a service charge. (This privilege is subject to
change or termination.)

ACCESS YOUR MONEY QUICKLY.

You  can  get checks sent regularly or redeem shares any  business
day at the then-current net asset value, which may be more or less
than their original cost.

For  details  about any of these or other services,  contact  your
financial  advisor or call the toll-free number  shown  below  and
speak with a helpful Putnam representative.

To make an additional investment in this or any other Putnam fund,
contact your financial advisor or call our toll-free number: 1-800-
225-1581.
[FN]
*  Regular  investing, of course, does not guarantee a  profit  or
   protect against a loss in a declining market. Investors  should
   consider  their  ability to continue purchasing  shares  during
   periods of low price levels.
[/FN]
<PAGE>
FUND INFORMATION

INVESTMENT MANAGER
Putnam Investment
Management, Inc.
One Post Office Square
Boston, MA 02109

MARKETING SERVICES
Putnam Mutual Funds Corp.
One Post Office Square
Boston, MA 02109

CUSTODIAN
Putnam Fiduciary Trust Company

LEGAL COUNSEL
Ropes & Gray

TRUSTEES
George Putnam, Chairman
William F. Pounds, Vice Chairman
Jameson Adkins Baxter
Hans H. Estin
John A. Hill
Elizabeth T. Kennan
Lawrence J. Lasser
Robert E. Patterson
Donald S. Perkins
George Putnam, III
A.J.C. Smith
Eli Shapiro
W. Nicholas Thorndike

OFFICERS
George Putnam
President

Charles E. Porter
Executive Vice President

Patricia C. Flaherty
Senior Vice President

John R. Verani
Vice President

Lawrence J. Lasser
Vice President

Gordon H. Silver
Vice President

Peter Carman
Vice President

Brett C. Browchuk
Vice President

Thomas V. Reilly
Vice President

Jeanne L. Mockard
Vice President and Fund Manager

William N. Shiebler
Vice President

Paul M. O'Neil
Vice President

John D. Hughes
Vice President and Treasurer

Beverly Marcus
Clerk and Assistant Treasurer

This  report  is  for  the information of shareholders  of  Putnam
Natural  Resources Fund. It may also be used as  sales  literature
when  preceded  or  accompanied by the current  prospectus,  which
gives  details  of  sales  charges,  investment  objectives,   and
operating  policies of the fund, and the most recent copy  of  the
Putnam Quarterly Performance Summary. For more information  or  to
request a prospectus, call toll free 1-800-225-1581.

Shares  of  mutual  funds are not deposits or obligations  of,  or
guaranteed  or  endorsed by, any financial  institution,  are  not
insured  by the Federal Deposit Insurance Corporation (FDIC),  the
Federal  Reserve  Board  or any other agency,  and  involve  risk,
including the possible loss of principal amount invested.

<PAGE>
PUTNAM INVESTMENTS
THE PUTNAM FUNDS
One Post Office Square
Boston, Massachusetts 02109

                                                         Bulk Rate
                                                      U.S. Postage
                                                              PAID
                                                            Putnam
                                                       Investments

018-17509
<PAGE>
APPENDIX TO FORM N-30D FILINGS TO DESCRIBE DIFFERENCES BETWEEN
PRINTED AND EDGAR-FILED TEXTS.

(1)  Rule lines for tables are omitted.

(2)  Italic typefaces is displayed in normal type.

(3)  Boldface type is displayed in capital letters.

(4)  Headers (e.g. the names of the fund) and footers (e.g. page
     numbers and OThe accompanying notes are an integral part of
     these financial statementsO) are omitted.

(5)  Because the printed page breaks are not reflected, certain
     tabular and columnar headings and symbols are displayed
     differently in this filing.

(6)  Bullet points and similar graphic symbols are omitted.

(7)  Page numbering is different.



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