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Figures 2, 3, 5, and 6: Barrier Pillars in Lackawanna Basin, Northern Field: Anthracite Region of Pennsylvania
Maps showing the effects of barrier pillars on water flow in relation to mines in Lackawanna Basin, northern field of the Anthracite Region of Pennsylvania. Scale 1:4,500 feet.
Date:
1952
Creator:
United States. Bureau of Mines.
System:
The UNT Digital Library