PIERCE LEAHY CORP
SC 13G/A, 1999-02-16
PUBLIC WAREHOUSING & STORAGE
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<PAGE>
 
                                 UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549


                                SCHEDULE 13G/A

          INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO
           RULES 13d-1(b), (c), AND (d) AND AMENDMENTS THERETO FILED
                           PURSUANT TO RULE 13d-2(b)
                               (Amendment No. 1)


                              Pierce Leahy Corp.
      ------------------------------------------------------------------
                               (Name of Issuer)

                                 Common Stock
      ------------------------------------------------------------------
                        (Title of Class of Securities)

                                  720722 10 7
                       ---------------------------------
                                (CUSIP Number)



Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

  ___ Rule 13d-1(b)
  ___ Rule 13d-1(c)
   X  Rule 13d-1(d)
  ---



The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                               Page 1 of 5 pages
<PAGE>
 
- -------------------------------                           ---------------------
     CUSIP No. 720722 10 7               13G                Page 2 of 5 Pages
- -------------------------------                           ---------------------
 
- ------------------------------------------------------------------------------
      NAME OF REPORTING PERSON
 1    S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
               Mary E. Pierce
                                                                               
- ------------------------------------------------------------------------------
      CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
 2                                                              (a) [_]
                                                                (b) [_]
                                                 
- ------------------------------------------------------------------------------
      SEC USE ONLY
 3
 

- ------------------------------------------------------------------------------
      CITIZENSHIP OR PLACE OF ORGANIZATION
 4         United States of America


- ------------------------------------------------------------------------------
                          SOLE VOTING POWER
                     5                0
     NUMBER OF            
 
      SHARES       -----------------------------------------------------------
                          SHARED VOTING POWER
   BENEFICIALLY      6                0
                          
     OWNED BY
                   -----------------------------------------------------------
       EACH               SOLE DISPOSITIVE POWER
                     7                1,391,953
    REPORTING             
 
      PERSON       -----------------------------------------------------------
                          SHARED DISPOSITIVE POWER
       WITH          8                0
                          
- ------------------------------------------------------------------------------
      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 9                           1,391,953

- ------------------------------------------------------------------------------
      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
10           
                                                                    
 
- ------------------------------------------------------------------------------
      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
11           8.2%
                                                                         

- ------------------------------------------------------------------------------
      TYPE OF REPORTING PERSON*
12           IN
      

- ------------------------------------------------------------------------------

                     *SEE INSTRUCTIONS BEFORE FILLING OUT!

                               Page 2 of 5 pages
<PAGE>
 
                                 SCHEDULE 13G


Item 1.

1(a).  Name of Issuer:  Pierce Leahy Corp.

1(b).  Address of Issuer's Principal Executive Offices:

          631 Park Avenue, King of Prussia, Pennsylvania 19406

Item 2.

2(a).  Name of Person Filing:  Mary E. Pierce

2(b).  Address of Principal Business Office:

          c/o 631 Park Avenue, King of Prussia, Pennsylvania 19406

2(c).  Citizenship:  U.S.

2(d).  Title of Class of Securities:  Common Stock, $.01 par value

2(e).  CUSIP Number:  720722 10 7

Item 3.

          Not Applicable.

Item 4.   Ownership

          As of December 31, 1998, Mary E. Pierce beneficially owned (as
calculated in accordance with Rule 13d-3) 1,391,953 shares of Common Stock,
representing 8.2% of the Common Stock then outstanding.  All of such shares are
held in a Voting Trust pursuant to a Voting Trust Agreement dated June 24, 1997
(as amended or restated from time to time, the "Voting Trust") or pursuant to
proxies issued in connection with the Voting Trust.  The Voting Trustees under
the Voting Trust have the right to vote the shares held in the Voting Trust or
subject to such proxies.  Accordingly, Ms. Pierce has no voting power (sole or
shared) with respect to the shares beneficially owned by her.

          The beneficial owners of interests in the Voting Trust or the shares
subject to the proxies have the right to dispose of the shares as to which they
have beneficial interests.  Ms. Pierce has a direct beneficial interest in
1,391,953 shares of Common Stock, and as such, has sole power to dispose of such
shares.

                               Page 3 of 5 pages
<PAGE>
 
Item 5.   Ownership of Five Percent or Less of a Class

          Not Applicable.

Item 6.   Ownership of More than Five Percent on Behalf of Another Person

          Not Applicable.

Item 7.   Identification and Classification of the Subsidiary Which Acquired the
          Security Being Reported on By the Parent Holding Company

          Not Applicable.

Item 8.   Identification and Classification of Members of the Group

          Not Applicable.

Item 9.   Notice of Dissolution of Group

          Not Applicable.

Item 10.  Certification

          Not Applicable

                               Page 4 of 5 pages
<PAGE>
 
                                   SIGNATURE


          After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.


                                              FEBRUARY 12, 1999
                                              -----------------  
                                              Date


                                              /s/ Mary E. Pierce
                                              ------------------          
                                              Signature


                                                        Mary E. Pierce
                                              ---------------------------------
                                                          Name/Title


                               Page 5 of 5 pages


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