0000950129-07-003166 11-K 2 20061231 20070628 20070628 WASTE MANAGEMENT INC 0000823768 4953 731309529 DE 1231 11-K 34 001-12154 07947228 1001 FANNIN STREET STE 4000 HOUSTON TX 77002 7135126200 1001 FANNIN STREET SUITE 4000 HOUSTON TX 77002 USA WASTE SERVICES INC 19920703 11-K 1 h47873be11vk.htm FORM 11-K EX-23.1 2 h47873bexv23w1.htm CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM