Department of the Interior. Albert B. Fall, Secretary. United States Geological Survey. George Otis Smith, Director. Bulletin 726 Contributions to economic geology (short papers and preliminary reports) 1921.

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Department of the Interior. Albert B. Fall, Secretary. United States Geological Survey. George Otis Smith, Director. Bulletin 726 Contributions to economic geology (short papers and preliminary reports) 1921.

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主题词：Geological surveys. ; Geology. ; Mines and mineral resources.
责任者：Geological Survey (U.S.)
出版者：Govt. Print. Off.
出版年：1922
出版地：Washington, D.C. :
出版日期：1922-01-01
分类号：254.2
语言：eng

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