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Economic Geology of Richmond, Virginia, and Vicinity, by N.H. Darton. [U.S. Geological Survey Bulletin 483.].

Nelson Horatio DartonUnited States. Congress. House

出版	U.S. Government Printing Office, 1911
URL	http://books.google.com.hk/books?id=EZt4QwAACAAJ&hl=&source=gbs_api