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Hydraulic coal mining research :development mining in a steeply pitching coalbed, Roslyn, Wash.

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)

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