APA

United States, . (1977). Black lung benefits provisions of the Federal coal mine health and safety act: hearings before the Committee on Education and Labor, House of Representatives, Ninety-fifth Congress ... Washington, D.C., March 14-17, 21, 1977. Washington: U.S. Govt. Print. Off.

Chicago

United States, . 1977. Black lung benefits provisions of the Federal coal mine health and safety act: hearings before the Committee on Education and Labor, House of Representatives, Ninety-fifth Congress ... Washington, D.C., March 14-17, 21, 1977. Washington: U.S. Govt. Print. Off.

Harvard

United States, . (1977). Black lung benefits provisions of the Federal coal mine health and safety act: hearings before the Committee on Education and Labor, House of Representatives, Ninety-fifth Congress ... Washington, D.C., March 14-17, 21, 1977. Washington: U.S. Govt. Print. Off.

MLA

United States, . Black lung benefits provisions of the Federal coal mine health and safety act: hearings before the Committee on Education and Labor, House of Representatives, Ninety-fifth Congress ... Washington, D.C., March 14-17, 21, 1977. Washington: U.S. Govt. Print. Off. 1977.