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The geologic time classification of the United States Geological survey compared with other classifications, accompanied by the original definitions of era, period and epoch terms.

By Wilmarth, M. Grace.
Washington, Govt. print. off., 1925 .
vi, 138 p. 23 cm..

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Some graphs on the calculation of geological age,

By Wickman, Frans E..
Stockholm, Kungl. Boktryckeriet, P.A. Norstedt & Söner, 1939 .
8 p. incl. tables. 24 cm..

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A graph for the calculation of the age of minerals according to the lead method,

By Wickman, Frans E..
Stockholm, Kungl. boktryckeriet, P.A. Norstedt & söner, 1944 .
6 p. , At head of title: Sveriges geologiska undersökning ... 24 cm..

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Isotopic age determinations of Nevada rocks /

By Schilling, John Harold,.
Reno, Nev. : Mackay Schools [sic] of Mines, University of Nevada : | For sale by the Nevada Bureau of Mines, University of Nevada, 1965 .
iv, 79 p. : 28 cm..

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