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