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Hydraulic coal mining research :development mining in a steeply pitching coalbed, Roslyn, Wash.
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Published Year
1960-1969 (1) *
Subject
Coal mines and mining--Research (1)
Hydraulic mining--Research (1)
Hydraulic mining--Washington (State) (1) *
Author
Badda, Frank. (1)
Price, George Cletus, (1)
