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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
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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) *
