Geologic map of the Oh-Be-Joyful quadrangle, Gunnison County, Colorado

af Gaskill, David L.
Washington, D.C. : U.S. Geological Survey, 1967

Geologic map of the Marble quadrangle, Gunnison and Pitkin Counties, Colorado

af Gaskill, David L.
Washington, D.C. : U.S. Geological Survey, 1966

Geologic map of the Marcellina Mountain quadrangle, Gunnison County, Colorado

af Gaskill, David L.
Washington, D.C. : U.S. Geological Survey, 1966

Geologic map of the Marble quadrangle, Gunnison and Pitkin Counties, Colorado /

af Gaskill, David L.
Washington, D.C. : The Survey, 1966

Geologic map of the Marcellina Mountain quadrangle, Gunnison County, Colorado /

af Gaskill, David L.
Washington, D.C. : The Survey, 1966

Geologic map of the Oh-Be-Joyful quadrangle, Gunnison County, Colorado /

af Gaskill, David L.
Washington, D.C. : The Survey, 1967

Relation of the carbon/oxygen ratio in coal to igneous intrusions in the Somerset coal field, Colorado : a study of the carbon-to-oxygen ratio in coals metamorphosed to higher than...

af Dyni, John R., Gaskill, David L.
[Reston, Va.] : United States Department of the Interior, Geological Survey, 1980

Waterpower resources of the Wilson River basin, Oregon : with a section on geology /

af Neal, Donald W., Gaskill, David L.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1961

Marble Gorge and Grand Canyon,

af Simmons, George Clarke, 1923-, Gaskill, David L.
Flagstaff, Ariz., Northland Press 1969

Waterpower resources of the United States 1960-65 /

af Young, Loyd L., 1909-, Gaskill, David L., Neal, Donald W.
Washington, D.C. : U.S. Department of the Interior, U.S. Geological Survey, 1966

Mineral resources of an area near the Popo Agie Primitive Area, Fremont County, Wyoming /

af Pearson, Robert Carl, 1926-, Patten, Lowell L., Gaskill, David L.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1973

Waterpower resources in Trask River basin, Oregon /

af Young, Loyd L., 1909-1981, Gaskill, David L., Wayland, R. G.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1963

Waterpower resources of the United States 1960-65 /

af Young, Loyd L., 1909-1981, Gaskill, David L., Neal, Donald W.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1966

Mineral resources of the Absaroka Primitive Area and vicinity, Park and Sweet Grass Counties, Montana /

af Wedow, Helmuth, 1917-, Banister, D'Arcy P., Gaskill, David L., Pattee, Eldon C., Peterson, Donald L.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1975

Waterpower resources in Nehalem River Basin, Oregon /

af Young, Loyd L., 1909-, Colbert, J. L., Gaskill, David L., Piper, Arthur M. (Arthur Maine), 1898-1989
Washington, D.C. : U.S. Department of the Interior, U.S. Geological Survey, 1965

Waterpower resources in Nehalem River Basin, Oregon /

af Young, Loyd L., 1909-1981, Colbert, J. L., Gaskill, David L., Piper, Arthur M. (Arthur Maine), 1898-1989
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1965

Relation of the carbon/oxygen ratio in coal to igneous intrusions in the Somerset coal field, Colorado /

af Dyni, John R.
Washington : U.S. Govt. Print. Off., 1978

Relation of the carbon/oxygen ratio in coal to igneous intrusions in the Somerset coal field, Colorado : a study of the carbon-to-oxygen ratio in coals metamorphosed to higher than...

af Dyni, John R.
Washington : U.S. Govt. Print. Off. : For sale by the Supt. of Docs., 1980

Reconnaissance geologic map of the Gila Wilderness Study Area, southwestern New Mexico

af Ratté, James Clifford, 1925-
Reston, Va. : U.S. Geological Survey, 1975

Geologic map of the Crested Butte quadrangle, Gunnison County, Colorado

Reston, VA : The Survey, 1986