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