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Backfilling problem in the anthracite region as it relates to conservation of anthracite and prevention of subsidence
Acid mine water in the anthracite region of Pennsylvania
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Published Year
1940-1949 (2) *
Subject
Anthracite coal--Pennsylvania (2)
Acid mine drainage--Pennsylvania (1)
Coal mines and mining--Pennsylvania (1)
Mining engineering (1)
Subsidences (Earth movements) (1)
Author
Westfield, James. (2) *
Ash, S. H. (1)
Felegy, E. W. (1)
Johnson, Leland H. (1)
