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Anthracite mechanical-mining investigations :use of yielding steel supports (props) in combination with backfilling for mining thick, flat beds

Published Year

• 1950-1959 (1)

Subject

• Anthracite coal industry (1)
• Coal-mining machinery (1) *

Author

• Brennan, Robert J. (1)
• Cooner, John D. (1) *
• Hartley, John C. (1)

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