APA (7th ed.) Citation

Olson, J. C. (1976). Geologic map of the Iris quadrangle, Gunnison and Saguache counties, Colorado. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Olson, J. C. Geologic Map of the Iris Quadrangle, Gunnison and Saguache Counties, Colorado. Reston, Va.: U.S. Geological Survey, 1976.

MLA (8th ed.) Citation

Olson, J. C. Geologic Map of the Iris Quadrangle, Gunnison and Saguache Counties, Colorado. U.S. Geological Survey, 1976.