In this part of Pennsylvania, subsidence is commonly associated with coal mining: When coal is removed from the earth, it leaves voids in its wake. Some collapse right away, sinking the surface above.
Vol. II, pt. I-II, paged continuously. Accompanied by 2 folded maps: "Geological and topographical map of the anthracite fields ..." and "Geological map of the state ..." "On the origin and ...
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