Oversight of the Mine Safety and Health Administration : hearings before the Committee on Labor and Human Resources, United States Senate, One hundredth Congress, first session, on examining activities of the Mine Safety and Health Administration, March 11 and 12, 1987

"Oversight of the Mine Safety and Health Administration : hearings before the Committee on Labor and Human Resources, United States Senate, One hundredth Congress, first session, on examining activities of the Mine Safety and Health Administration, March 11 and 12, 1987"@en
"Oversight of the Mine Safety and Health Administration hearings before the Committee on Labor and Human Resources, United States Senate, One hundredth Congress, first session, on examining activities of the Mine Safety and Health Administration, March 11 and 12, 1987"@en