APA (7th ed.) Citation

Geological Survey (U.S.) & Fridrich, C. J. (1998). Geologic map of the Collegiate Peaks Wilderness Area and the Grizzly Peak Caldera, Sawatch Range, central Colorado. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and C. J. Fridrich. Geologic Map of the Collegiate Peaks Wilderness Area and the Grizzly Peak Caldera, Sawatch Range, Central Colorado. [Reston, Va.]: The Survey, 1998.

MLA (9th ed.) Citation

Geological Survey (U.S.) and C. J. Fridrich. Geologic Map of the Collegiate Peaks Wilderness Area and the Grizzly Peak Caldera, Sawatch Range, Central Colorado. The Survey, 1998.