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Mississippian Formations of San Saba County, Texas by P.V. Roundy, George H. Girty, and Marcus I. Goldman. [U.S. Geological Survey Professional Paper 146.].

United States. Congress. House

出版	U.S. Government Printing Office, 1926
URL	http://books.google.com.hk/books?id=ow3QwQEACAAJ&hl=&source=gbs_api