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Multiple-shift mechanical mining in some bituminous-coal mines.
An analysis of the use of electricity at coal mines.
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Published Year
1940-1949 (2)
Subject
Coal mines and mining--Equipment and supplies (2) *
Bituminous coal (1)
Coal-handling machinery (1)
Author
Maize, Earl R. (2) *
Jones, Frank A. (1)
Thomas, Edward. (1)
Toenges, Albert L. (1)
Toenges, Albert L.. (1)
