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Contributions to Economic Geology (short Papers and Preliminary Reports), 1912. Part II. -- Mineral Fuels. Marius R. Campbell, Geologist in Charge. [U.S. Geological Survey Bulletin 541.].

United States. Congress. House

出版	1914
URL	http://books.google.com.hk/books?id=LGd_zQEACAAJ&hl=&source=gbs_api