0000912057-01-515977 10-Q 3 20010331 20010515 IRON MOUNTAIN INC/PA 0001020569 4220 232588479 PA 1231 10-Q 34 001-13045 1637957 745 ATLANTIC AVENUE BOSTON MA 02111- 6175354766 745 ATLANTIC AVENUE BOSTON MA 02111- PIERCE LEAHY CORP 19960807 10-Q 1 a2049379z10-q.txt FORM 10-Q EX-4.1 2 a2049379zex-4_1.txt EXHIBIT 4.1 EX-4.2 3 a2049379zex-4_2.txt EXHIBIT 4.2