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House Hearing, 93rd Congress - Black Lung Amendments of 1973: hearings before the General Subcommittee on Labor of the Committee on Education and Labor, House of Representatives, Ninety-third Congress, first and second sessions, on H.R. 3476, H.R. 8834, H.R. 8835, and H.R. 8838, bills to amend the Federal Coal Mine Health and Safety Act of 1969.