United States. Congress. Senate. Committee on Labor and Public Welfare. Subcommittee on Labor & ProQuest (Firm). (1969). Coal Mine Health and Safety: Hearings before the United States Senate Committee on Labor and Public Welfare, Subcommittee on Labor, Ninety-First Congress, first session. U.S. G.P.O..
Chicago Style (17th ed.) CitationUnited States. Congress. Senate. Committee on Labor and Public Welfare. Subcommittee on Labor and ProQuest (Firm). Coal Mine Health and Safety: Hearings Before the United States Senate Committee on Labor and Public Welfare, Subcommittee on Labor, Ninety-First Congress, First Session. Washington: U.S. G.P.O., 1969.
MLA (9th ed.) CitationUnited States. Congress. Senate. Committee on Labor and Public Welfare. Subcommittee on Labor and ProQuest (Firm). Coal Mine Health and Safety: Hearings Before the United States Senate Committee on Labor and Public Welfare, Subcommittee on Labor, Ninety-First Congress, First Session. U.S. G.P.O., 1969.