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Use of geophone in locating compressed-air leaks

Why miners' portable electric lamps require safety devices

List of permissible mining equipment

List of permissible mining equipment

List of permissible mining equipment

List of permissible mine equipment

List of permissible mining equipment

List of permissible mine equipment

Underground chute gates in metal mines

List of permissible mine equipment

List of permissible mine equipment

List of permissible mine equipment

List of permissible mine equipment approved during 1937

Diamond-drilling blast holes, eastern magnetite "Mine B"

Mobile diesel-powered transportation equipment for gassy noncoal mines and tunnels approved by the Bureau of Mines, 1961-66


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