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Geology and Mineral Resources of the Philipsburg 7 1/2-minute Quadrangle, Pennsylvania

Gary B. Glass

出版	Commonwealth of Pennsylvania, Department of Environmental Resources, Bureau of Topographic and Geologic Survey, 1974
URL	http://books.google.com.hk/books?id=PIOb6cFM1FsC&hl=&source=gbs_api