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Mineral Resources of the United States, 1915, [by] H.D. McCaskey, Geologist in Charge, Division of Mineral Resources. Part II. -- Nonmetals, [by] E.F. Burchard, Geologist in Charge

United States. Congress. House

出版	1917
URL	http://books.google.com.hk/books?id=9Af4wQEACAAJ&hl=&source=gbs_api