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by Crowl, G. H.
Harrisburg : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey : May be purchased from State Book Store, 1980
“...General geology report ;...”Harrisburg : Commonwealth of Pennsylvania, Dept. of Environmental Resources, Bureau of Topographic and Geologic Survey : May be purchased from State Book Store, 1980
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Government Document
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