| 题名 |
MSHA oversight hearings on coal mine explosions during December 1981 and January 1982 : hearings before the Subcommittee on Health and Safety of the Committee on Education and Labor, House of Representatives, Ninety-seventh Congress, second session, hearings held in Washington, D.C., on February 23; March 2, 9, 16, 23; and May 4, 1982. |
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