An edition of Oversight on MSHA--roof falls in underground mining operations and the use of roof monitoring devices (1984)

Oversight on MSHA--roof falls in underground mining operations and the use of roof monitoring devices

hearing before the Subcommittee on Health and Safety of the Committee on Education and Labor, House of Representatives, Ninety-eighth Congress, second session, hearing held in Washington, DC, on April 25, 1984

By United States. Congress. House. Committee on Education and Labor. Subcommittee on Health and Safety