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Geology and thorium deposits of the Wet Mountains, Colorado : a progress report

Christman, Robert A. (Robert Adam), 1924- author.
Washington, D.C. : United States Department of the Interior, Geological Survey, 1959. 1959

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

Pearson, Robert Carl, 1926- author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1973. 1973

Mineral resources of the Eastern Pioneer Mountains, Beaverhead County, Montana

Pearson, Robert Carl, 1926- author.
[Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1988. 1988

Mineral resources of the Farlin Creek Wilderness Study Area, Beaverhead County, Montana

Pearson, Robert Carl, 1926- author.
[Reston, Va.] : Department of the Interior, U.S. Geological Survey, 1987. 1987

Mineral resources of the Indian Peaks study area, Boulder and Grand Counties, Colorado

Pearson, Robert Carl, 1926- author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1980. 1980

Mineral resources of the Popo Agie primitive area, Fremont and Sublette Counties, Wyoming

Pearson, Robert Carl, 1926- author.
[Washington, D.C.] : United States Department of the Interior, Geological Survey, 1971. 1972