The mineral production of Pennsylvania, 1911, 1913 Pennsylvania Bureau of Topographic and Geologic Survey. creator text pau Harrisburg, Pa [1912?-14?] 1912 1914 monographic eng
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2 v. 24 cm. n-us-pa Mines and mineral resources Pennsylvania GA61.P4 A5 Report ; 8, 11 Pennsylvania. Bureau of Topographic and Geologic Survey. gs 15000720 DLC 940914 20260227111318.0 gs 15000720