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Backfilling problem in the anthracite region as it relates to conservation of anthracite and prevention of subsidence

Published Year

• 1940-1949 (1)

Subject

• Anthracite coal--Pennsylvania (1)
• Coal mines and mining--Pennsylvania (1) *
• Mining engineering (1)
• Subsidences (Earth movements) (1)

Author

• Ash, S. H. (1)
• Westfield, James. (1) *

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