Actions for Occupational Safety and Health Act legislation affecting the United States Postal Service : hearings before the Subcommittee on Postal Personnel and Modernization of the Committee on Post Office and Civil Service, House of Representatives, Ninety-sixth Congress, first session on H.R. 826, a bill to amend Title 39, United States Code, to provide that the United States Postal Service shall be subject to certain provisions of the Occupational Safety and Health Act of 1970, June 6 and 7, 1979