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Geology and Mineral Resources of the Ramey and Houtzdale Quadrangles, Clearfield and Centre Counties, Pennsylvania
Gary B. GlassPennsylvania. Bureau of Topographic and Geologic Survey
出版Commonwealth of Pennsylvania, Department of Environmental Resources, Bureau of Topographic and Geologic Survey, 1977
URLhttp://books.google.com.hk/books?id=QE0X7y454GsC&hl=&source=gbs_api