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by Cleaves, Arthur B. (Arthur Bailey), 1905-1985, Stephenson, Robert C. (Robert Charles), 1916-
[Harrisburg, Pennsylvania] : Department of Internal Affairs, Topographic and Geologic Survey, 1949
Subjects:
“...Geology Pennsylvania Handbooks, manuals, etc....”[Harrisburg, Pennsylvania] : Department of Internal Affairs, Topographic and Geologic Survey, 1949
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Government Document
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