Department of the Interior. Albert B. Fall, Secretary. United States Geological Survey. George Otis Smith, Director. Bulletin 716 Contributions to economic geology (short papers and preliminary reports) 1920

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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：1921
• 出版地：Washington, D.C. :
• 出版日期：1921-01-01
• 分类号：254.2
• 语言：英文

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