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Mechanical mining in some bituminous-coal mines.
Mechanical mining in some bituminous-coal mines.
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Published Year
1950-1959 (2) *
Subject
Bituminous coal industry--United States (2)
Coal-mining machinery (2)
Author
Dowd, J. J. (2)
Haley, W. A. (2)
Shields, J. J. (2) *
Magnuson, M. O. (1)
