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Review of Bureau of Mines coal program,1965
Review of Bureau of Mines coal program, 1967
Review of Bureau of Mines Coal Program, 1968
Review of Bureau of Mines coal program,1969
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Published Year
1960-1969 (3)
1970-1979 (1)
Subject
Coal preparation (4) *
Coal mines and mining (3)
Coal--Research (2)
Coal mines and mining--United States (1)
Author
Spencer, John D. (4) *
