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2 results returnedHydraulic coal mining research :tests in a steeply pitching coalbed, Rosalyn, Wash.
Hydraulic coal mining research :development mining in a steeply pitching coalbed, Roslyn, Wash.
Published Year
Subject
- Coal mines and mining--Research (2) *
- Hydraulic mining (1)
- Hydraulic mining--Research (1)
- Hydraulic mining--Washington (State) (1)
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