CALVERT SOCIAL INVESTMENT FUND
NSAR-B, 1997-11-19
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<PAGE>      PAGE  1
000 B000000 09/30/97
000 C000000 0000356682
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0
000 J000000 A
001 A000000 CALVERT SOCIAL INVESTMENT FUND
001 B000000 811-3334
001 C000000 3019514881
002 A000000 4550 MONTGOMERY AVE., SUITE 1000N
002 B000000 BETHESDA
002 C000000 MD
002 D010000 20814
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  4
007 C010100  1
007 C020100 MONEY MARKET PORTFOLIO
007 C030100 N
007 C010200  2
007 C020200 MANAGED GROWTH PORTFOLIO
007 C030200 N
007 C010300  3
007 C020300 BOND PORTFOLIO
007 C030300 N
007 C010400  4
007 C020400 EQUITY PORTFOLIO
007 C030400 N
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
020 A000001 JOHNSTON, LEMON & CO
020 C000001    113
020 A000002 PAINE WEBBER INC
020 C000002     58
020 A000003 DONALDSON LUFKIN & JENRETTE SECURITIES CORP
020 C000003     54
020 A000004 DEAN WITTER REYNOLDS INC.
020 C000004     46
020 A000005 CAPITAL INSTITUTIONAL SERVICES INC.
020 C000005     44
020 A000006 LIPPER ANALYTICAL SECURITIES CORP
<PAGE>      PAGE  2
020 C000006     44
020 A000007 BEAR STEARNS SECURITIES CORP
020 C000007     40
020 A000008 INSTINET
020 C000008     39
020 A000009 BLAIR (WILLIAM) AND CO
020 C000009     30
020 A000010 COWEN & CO
020 C000010     23
021  000000      877
022 A000001 DONALDSON LUFKIN
022 C000001   4336173
022 D000001     61982
022 A000002 STATE STREET BANK
022 C000002   2779600
022 D000002         0
022 A000003 UBS SECURITIES INC.
022 C000003   1883784
022 D000003      2983
022 A000004 MERRIL LYCNCH PIERCE
022 C000004    288542
022 D000004    220233
022 A000005 GOLDMAN SACHS
022 C000005    182885
022 D000005    130613
022 A000006 SALOMON BROTHERS INC
022 C000006    161536
022 D000006    120093
022 A000007 PAINE WEBBER INCORP
022 C000007    221820
022 D000007     56392
022 A000008 SMITH BARNEY INC
022 C000008    114858
022 D000008    102440
022 A000009 LEHMAN BROS INC
022 C000009     70119
022 D000009     77639
022 A000010 MORGAN STANLEY
022 C000010     82612
022 D000010     45328
023 C000000   10987077
023 D000000    1616066
027  000000 Y
077 A000000 Y
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080 A00AA00 ICI MUTUAL INSURANCE COMPANY
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081 A00AA00 Y
081 B00AA00  39
082 A00AA00 N
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<PAGE>      PAGE  3
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
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<PAGE>      PAGE  11
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SIGNATURE   WILLIAM M. TARTIKOFF                         
TITLE       GENERAL COUNSEL     
 


<TABLE> <S> <C>

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<CIK> 0000356682
<NAME> CALVERT SOCIAL INVESTMENT FUND
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   <NAME> MONEY MARKET PORTFOLIO
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000356682
<NAME> CALVERT SOCIAL INVESTMENT FUND
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</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

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<CIK> 0000356682
<NAME> CALVERT SOCIAL INVESTMENT FUND
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   <NAME> MANAGED GROWTH PORTFOLIO, CLASS C
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

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<CIK> 0000356682
<NAME> CALVERT SOCIAL INVESTMENT FUND
<SERIES>
   <NUMBER> 243
   <NAME> BOND PORTFOLIO
<MULTIPLIER> 1000
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000356682
<NAME> CALVERT SOCIAL INVESTMENT FUND
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   <NUMBER> 213
   <NAME> EQUITY PORTFOLIO, CLASS A
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000356682
<NAME> CALVERT SOCIAL INVESTMENT FUND
<SERIES>
   <NUMBER> 154
   <NAME> EQUITY PORTFOLIO, CLASS C
<MULTIPLIER> 1000
       
<S>                             <C>
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</TABLE>


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