Petrography of radioactive tertiary igneous rocks, Front Range mineral belt, Colorado /

by Wells, John David, 1926-
Washington, [D.C.] : U.S. G.P.O., 1960

Geology of the Eldorado Springs quadrangle, Boulder and Jefferson Counites, Colorado, by John D. Wells.

by Wells, John David, 1926-
Washington, U.S. Govt. Print. Off., 1967

Petrography of radioactive tertiary igneous rocks, Front Range mineral belt, Colorado /

by Wells, John David, 1926-
Washington : U.S. Govt. Print. Off., 1960

Stratigraphy and structure of the House Rock Valley area, Coconino County, Arizona /

by Wells, John David, 1926-
Washington : U.S. Govt. Print. Off., 1960

Stratigraphy and structure of the House Rock Valley area, Coconino County, Arizona /

by Wells, John David, 1926-
Washington, [D.C.] : U.S. G.P.O., 1960

Geochemical reconnaissance of the Cortez-Buckhorn area, southern Cortez Mountains, Nevada /

by Wells, John David, 1926-
Washington, D.C. : U.S. Government Printing Office, 1971

Geochemical reconnaissance of the Cortez-Buckhorn area, southern Cortez Mountains, Nevada /

by Wells, John David, 1926-
Washington : U.S. Govt. Print. Off., 1971

Radioactivity reconnaissance of part of north-central Clear Creek county, Colorado /

by Wells, John David, 1926-
Washington, D.C. : U.S. Geological Survey, 1954

Relationship of Precambrian quartziteschist sequence along Coal Creek to Idaho Springs Formation, Front Range, Colorado,

by Wells, John David, 1926-
Washington, U.S. Govt. Print. Off., 1964

Geology of the Eldorado Springs quadrangle, Boulder and Jefferson counties, Colorado : petrography, stratigraphy, and structural geology of the Precambrian metamorphic and igneous...

by Wells, John David, 1926-
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1967

Petrography of radioactive tertiary igneous rocks, Front Range mineral belt, Colorado /

by Wells, John David, 1926-
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1960

Relationship of Precambrian quartziteschist sequence along Coal Creek to Idaho Springs Formation, Front Range, Colorado /

by Wells, John David, 1926-
Washington : U.S. Govt. Print. Off., 1964

Geology of the Eldorado Springs quadrangle, Boulder and Jefferson Counites, Colorado / by John D. Wells.

by Wells, John David, 1926-
Washington : U.S. Govt. Print. Off., 1967

Geology of the Eldorado Springs quadrangle, Boulder and Jefferson counties, Colorado : petrography, stratigraphy, and structural geology of the Precambrian metamorphic and igneous...

by Wells, John David, 1926-
Washington : U.S. Govt. Print. Off., 1967

Stratigraphy and structure of the House Rock Valley area, Coconino County, Arizona /

by Wells, John David, 1926-
Washington, D.C. : United States Department of the Interior, Geological Survey, 1960

Geochemical reconnaissance of the Cortez-Buckhorn area, southern Cortez Mountains, Nevada /

by Wells, John David, 1926-, Elliott, James E.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1971

Anomalous concentrations of gold, silver, and other metals in the Mill Canyon area, Cortez quadrangle, Eureka and Lander Counties, Nevada /

by Elliott, James E., Wells, John David, 1926-
Washington, D.C. : United States Department of the Interior, Geological Survey, 1968

Geology and ore deposits of the Chicago Creek area, Clear Creek County, Colorado /

by Harrison, Jack Edward, 1924-, Wells, John David, 1926-
Washington : United States Department of the Interior, Geological Survey, 1959

Geology and ore deposits of the Chicago Creek area, Clear Creek County, Colorado,

by Harrison, Jack Edward, 1924-, Wells, John David, 1926-
Washington, U.S. Govt. Print. Off., 1959

Geology and ore deposits of the Freeland-Lamartine district, Clear Creek County, Colorado /

by Harrison, Jack Edward, 1924-, Wells, John David, 1926-
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1956