U.S. BUREAU OF MINES RESEARCH and DEVELOPMENT MINING - PROGRAM MINING HEALTH AND SAFETY COAL MINING HEALTH RESEARCH COAL MINING SAFETY RESEARCH METAL AND NONMETAL HEALTH AND SAFETY ADVANCING MINING TECHNOLOGY COAL MINING (UNDERGROUND AND SURFACE) OIL SHALE MINING METAL AND NONMETAL MINING EXPLOSIVES RESEARCH ENVIRONMENT MINED LAND INVESTIGATIONS AND DEMONSTRATIONS FIRE CONTROL IN COAL DEPOSITS |