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

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

Published Year

• 1940-1949 (2)

Subject

• Coal (2)
• Coal mines and mining--United States (2) *

Author

• Brewer, Ralph Emmet, (2) *
• Fieldner, Arno Carl, (2)
• Fisher, P.L. (1)

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