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Contributions to economic geology, 1905, [by] S.F. Emmons, E.C. Eckel, geologists in charge. [U.S. Geological Survey Bulletin No. 285. Series A, Economic Geology, 73.]
Published 1906Online Access
Government Document Electronic eBook -
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Contributions to economic geology, 1903. S. F. Emmons, C.W. Hayes, Geologists in Charge. [U.S. Geological Survey Bulletin No. 225. Series A, Economic Geology, 33.]
Published 1904Online Access
Government Document Electronic eBook