APA (7th ed.) Citation

Geological Survey (U.S.), Johnson, B. R., & Bruce, R. M. (1991). Reconnaissance geologic map of parts of the Twin Peaks and Blanca Peak quadrangles, Alamosa, Costilla, and Huerfano counties, Colorado. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.), Bruce R. Johnson, and Robert M. Bruce. Reconnaissance Geologic Map of Parts of the Twin Peaks and Blanca Peak Quadrangles, Alamosa, Costilla, and Huerfano Counties, Colorado. Reston, Va.: The Survey, 1991.

MLA (9th ed.) Citation

Geological Survey (U.S.), et al. Reconnaissance Geologic Map of Parts of the Twin Peaks and Blanca Peak Quadrangles, Alamosa, Costilla, and Huerfano Counties, Colorado. The Survey, 1991.