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Our Mineral Supplies, [by] H.D. McCaskey and E.F. Burchard, Geologists in Charge. [U.S. Geological Survey Bulletin 666.].

United States. Congress. House

出版	1918
URL	http://books.google.com.hk/books?id=p2DvwQEACAAJ&hl=&source=gbs_api