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Barrier pillars in southern field, anthracite region of Pennsylvania
Factual data on barrier pillars helpful in solving mine water problem; discussion of 29 barrier pillars and summary of composite barrier pillars by individual mines and groups of mines or pools.
Barrier pillars in southern field, anthracite region of Pennsylvania
Factual data on barrier pillars helpful in solving mine water problem; discussion of 29 barrier pillars and summary of composite barrier pillars by individual mines and groups of mines or pools.
Barrier pillars in southern field, anthracite region of Pennsylvania
U S Bur Mines -- Bul
Ash, S.H. (author) / Kynor, H.D. (author)
1953
43 pages
10 Maps in pocket
Report
English
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