0000950134-07-009469 424B5 1 20070430 20070430 WASTE MANAGEMENT INC 0000823768 4953 731309529 DE 1231 424B5 33 333-137526 07798600 1001 FANNIN STREET STE 4000 HOUSTON TX 77002 7135126200 1001 FANNIN STREET SUITE 4000 HOUSTON TX 77002 USA WASTE SERVICES INC 19920703 424B5 1 h46047e424b5.htm PROSPECTUS SUPPLEMENT