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

Annual report of research and technologic work on coal :fiscal year 1949

Published Year

• 1940-1949 (1)
• 1950-1959 (1)

Subject

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

Author

• Fieldner, Arno Carl, (2)
• Gottlieb, Sidney. (2) *

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