Metal and nonmetallic mine safety : hearings before the Subcommittee on Labor of the Committee on Labor and Public Welfare, United States Senate, Eighty-ninth Congress, second session on H.R. 8989, a bill to promote health and safety in metal and nonmetallic mineral industries, and for other purposes : S. 2972, a bill to promote health and safety in metal and nonmetallic mineral industries, and for other purposes : S. 996, a bill to provide a system of health and safety rules and regulations and proper enforcement thereof; health and safety inspection and investigation; health and safety training and education or metallic and nonmetallic mines and quarries (excluding coal and lignite mines); and for other purposes : S. 3094, a bill relating to certain inspections and investigations in metallic and nonmetallic mines and quarries (excluding coal and lignite mines) for the purpose of obtaining information relating to health and safety conditions, accidents, and occupational diseases therein, and for other purposes, March 21 and 22, 1966.