APA (7th ed.) Citation

Geological Survey (U.S.) & Gray, F. (1983). Geologic map of the North Fork Smith River Roadless Area, Del Norte County, northern California, and Curry County, Oregon. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Floyd Gray. Geologic Map of the North Fork Smith River Roadless Area, Del Norte County, Northern California, and Curry County, Oregon. Reston, Va.: The Survey, 1983.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Floyd Gray. Geologic Map of the North Fork Smith River Roadless Area, Del Norte County, Northern California, and Curry County, Oregon. The Survey, 1983.