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Mineral Resources of the Elders Ridge Quadrangle, Pennsylvania, by Ralph W. Stone. [U.S. Geological Survey Bulletin No. 256. Series A, Economic Geology, 51. Series B, Descriptive Geology, 63.].

Ralph Walter StoneUnited States. Congress. House

出版	U.S. Government Printing Office, 1905
URL	http://books.google.com.hk/books?id=4CxFQwAACAAJ&hl=&source=gbs_api