APA (7th ed.) Citation

Orr, W. N., & Miller, P. R. (1986). Geologic map of the Elk Prairie quadrangle, Marion and Clackamas Counties, Oregon. Oregon, Dept. of Geology and Mineral Industries.

Chicago Style (17th ed.) Citation

Orr, William N., and Paul R. Miller. Geologic Map of the Elk Prairie Quadrangle, Marion and Clackamas Counties, Oregon. [Portland, Or.].: Oregon, Dept. of Geology and Mineral Industries, 1986.

MLA (9th ed.) Citation

Orr, William N., and Paul R. Miller. Geologic Map of the Elk Prairie Quadrangle, Marion and Clackamas Counties, Oregon. Oregon, Dept. of Geology and Mineral Industries, 1986.