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Anthracite mechanical mining investigations.
Anthracite mechanical-mining investigations :use of yielding steel supports (props) in combination with backfilling for mining thick, flat beds
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Published Year
1950-1959 (2)
Subject
Anthracite coal industry (2) *
Coal-mining machinery (2)
Author
Hartley, John C. (2) *
Brennan, Robert J. (1)
Buch, John W. (1)
Cooner, John D. (1)
Landsidle, Clayton A. (1)
