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Mine explosions and fires in the United States during the fiscal year ended June 30, 1933

Coal-mine explosions and fires in the United States during the fiscal year ended June 30, 1934

Coal-mine explosions and coal- and metal-mine fires in the United States during the fiscal year ended June 30, 1936

Coal-mine explosions and fires in the United States :during the fiscal year ended June 30, 1935

Coal-mine explosions and coal- and metal-mine fires in the United States during the fiscal year ended June 30, 1937

Coal-mine explosions and coal- and metal-mine fires in the United States during the fiscal year ended June 30, 1938

Coal-mine explosions and coal- and metal-mine fires in the United States during the fiscal year ended June 30, 1944


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