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The Mineral Industry of Pennsylvania in 1962

Bernard J. O'NeillCharles C. YeloushanJames R. KerrJohn TomikelM. E. BeckVincent Chester Shepps

出版	Commonwealth of Pennsylvania, Department of Internal Affairs, Bureau of Topographic and Geologic Survey, 1966
URL	http://books.google.com.hk/books?id=GjISNZRkRfQC&hl=&source=gbs_api