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1
Contributions to economic geology, 1904, by S.F. Emmons, C.W. Hayes, geologists in charge. [U.S. Geological Survey Bulletin No. 260. Series A, Economic Geology, 53.]
Published 1905Online Access
Government Document Electronic eBook -
2
Mineral Resources of the United States, calendar year 1909. Part I. -- Metals.
Published 1911Online Access
Government Document Electronic eBook