Accident statistics as an aid to prevention of accidents in bituminous-coal mines :
coal-mine accident-prevention course.
Washington, D.C. : U.S. G.P.O., 1945.
Bituminous coal mines and mining
Bituminous coal mines and mining /
Coal mine accidents > Coal mine accidents / United States.
"List of miners' circulars": p. 39-40.
vi, 40 p. :
ill., map ;
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