APA (7th ed.) Citation

Rocky Mountain Association of Geologists. (1972). Geologic atlas of the Rocky Mountain region, United States of America. [publisher not identified].

Chicago Style (17th ed.) Citation

Rocky Mountain Association of Geologists. Geologic Atlas of the Rocky Mountain Region, United States of America. Denver, Colo.: [publisher not identified], 1972.

MLA (9th ed.) Citation

Rocky Mountain Association of Geologists. Geologic Atlas of the Rocky Mountain Region, United States of America. [publisher not identified], 1972.