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Underground transportation of coal :Progress report 1
Underground transportation of coal :progress report [No.] 2
An analysis of the use of electricity at coal mines.
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Published Year
1940-1949 (3)
Subject
Coal mines and mining--Equipment and supplies (3) *
Coal-handling machinery (3)
Mine haulage (2)
Author
Jones, Frank A. (3) *
Toenges, Albert L. (3)
Thomas, Edward. (2)
Maize, Earl R. (1)
