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Barrier Pillars in the Western Middle Field: Anthracite Region of Pennsylvania

Surface-Water Seepage into Anthracite Mines in the Southern Field: Anthracite Region of Pennsylvania

Published Year

• 1950-1959 (2) *

Author

• Ash, S. H. (Simon Harry), b. 1889 (2)
• Link, H. B. (2) *
• Kennedy, D. O. (1)

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