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Annual report of research and technologic work on coal, fiscal year 1940

Annual report of research and technologic work on coal, fiscal year 1939

Annual report of research and technologic work on coal :fiscal year 1944

Inspection standards for bituminous-coal and lignite mines :revised July 1945.

Annual report of research and technologic work on coal :fiscal year 1945

Wash and change houses at American mines

Annual report of research and technologic work on coal :fiscal year 1947

Annual report of research and technologic work on coal :fiscal year 1948


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