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Figures 2, 3, 5, and 6: Barrier Pillars in Lackawanna Basin, Northern Field: Anthracite Region of Pennsylvania
Year:
1952
Document Type:
N/A
Series:
United States Bureau of Mines Reports
Report Number:
Bulletin 517
Link:
https://digital.library.unt.edu/ark:/67531/metadc1855808/
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