EXHIBIT 23.4


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS


As independent  public  accountants,  we hereby consent to the  incorporation by
reference in this  registration  statement on Form S-3 of our report dated March
4,  1997,  (except  for Note 11, as to which the date is  October  1,  1997) for
Allegiance Business Archives, Ltd. included in Iron Mountain Incorporated's Form
8-K filed with the Securities and Exchange  Commission on November 25, 1997, and
to all references to our Firm included in this registration statement.




                                                  Stout, Causey & Horning, P.A.


Cockeysville, Maryland
January 5, 1998