Y 9283 : Coal-mine explosions and coal- and metal-mine fires in the United States during the fiscal year ended June 30, 1940 [Schriftenreihe: Information circular / United States Department of the Interior, Bureau of Mines] (1940)
Coal-mine explosions and coal- and metal-mine fires in the United States during the fiscal year ended June 30, 1940 [Schriftenreihe: Information circular / United States Department of the Interior, Bureau of Mines]