APA (7th ed.) Citation

United States. Forest Service. (1981). Hells Canyon National Recreation Area, visual resource inventory. [U.S. Forest Service].

Chicago Style (17th ed.) Citation

United States. Forest Service. Hells Canyon National Recreation Area, Visual Resource Inventory. [Washington]: [U.S. Forest Service], 1981.

MLA (9th ed.) Citation

United States. Forest Service. Hells Canyon National Recreation Area, Visual Resource Inventory. [U.S. Forest Service], 1981.

Warning: These citations may not always be 100% accurate.