Oversight hearings on the Federal Mine Safety and Health Amendments Act of 1977 nonmetallic mines : hearings before the Subcommittee on Health and Safety of the Committee on Education and Labor, House of Representatives, Ninety-sixth Congress, first session
United States.Congress.House.Committee on Education and Labor.Subcommittee on Health and Safety.
Washington U.S.G.P.O.
1980
Mine safety