APA (7th ed.) Citation

Geological Survey (U.S.) & Wallace, C. A. (1987). Generalized geologic map of the Butte 1°x 2° quadrangle, Montana. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and C. A. Wallace. Generalized Geologic Map of the Butte 1°x 2° Quadrangle, Montana. Reston, Va.: The Survey, 1987.

MLA (9th ed.) Citation

Geological Survey (U.S.) and C. A. Wallace. Generalized Geologic Map of the Butte 1°x 2° Quadrangle, Montana. The Survey, 1987.