erovnuli-samecniero-biblioteka Search for 'au:"Eckel, Edwin Butt,"'

The brown iron ores of eastern Texas,

By Eckel, Edwin Butt,.
Washington, U.S. Govt. Print. Off., 1938 .
vi, 157 p. incl. illus., , At head of title: United States Department of the Interior ... Geological Survey ... | Three of the folded maps are in pocket. 23 cm..

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Geology and ore deposits of the La Plata district, Colorado,

By Eckel, Edwin Butt,.
Washington, U.S. Govt. Print. Off., 1949 .
vii, 179 p. , Part of illustrative matter folded in pocket. 29 cm..

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Geology and mineral resources of Paraguay, a reconnaissance. /

By Eckel, Edwin Butt,.
Washington : U.S. Govt. Print. Off., 1959 .
v, 110 p. : 29 cm..

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Opportunities and responsibilities of earth scientists in the nuclear age.

By Eckel, Edwin Butt,.
Washington, 1960 .
8 p. , Prepared on behalf of the U. S. Atomic Energy Commission. 27 cm..

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Minerals of Colorado : a 100-year record /

By Eckel, Edwin Butt,.
Washington, [D.C.] : U.S. G.P.O., 1961 .
iii, 399 p. : , "A summary of the first 100 years of published knowledge, including the chief occurrences of 445 mineral species." | One folded col. map in pocket. 24 cm..

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