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The Chinle (Upper Triassic) and Sundance (Upper Jurassic) Formations in north-central Colorado : a d

Pipiringos, G. N. (George Nicholas), 1918- author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1969. 1969

Four newly named tongues of Eocene Green River Formation, northern Piceance Creek basin, Colorado,

Duncan, Donald C., 1911-1990 author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1974. 1974

Geology and uranium deposits in the Cave Hills area, Harding County, South Dakota

Pipiringos, G. N. (George Nicholas), 1918-
[Washington D.C.] : U.S. Dept. of the Interior, Geological Survey : For sale by the Supt. of Docs., U.S. G.P.O., 1965. 1965

Origin of elements associated with uranium in the Cave Hills Area, Harding County, South Dakota

Pipiringos, G. N. (George Nicholas), 1918-
[Washington D.C.] : U.S. Dept. of the Interior, Geological Survey : For sale by the Supt. of Docs., U.S. G.P.O., 1966. 1966

General geology of the Hahns Peak and Farwell Mountain quadrangles, Routt County, Colorado

Segerstrom, Kenneth, 1909- author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1972. 1972

Uranium-bearing coal in the central part of the Great Divide Basin

Pipiringos, G. N. (George Nicholas), 1918- author.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1961. 1961