APA (7th ed.) Citation

United States. Forest Service. (1981). Trinity Unit, Whiskeytown-Shasta-Trinity National Recreation Area (Scale [ca. 150,000].). U.S. Forest Service.

Chicago Style (17th ed.) Citation

United States. Forest Service. Trinity Unit, Whiskeytown-Shasta-Trinity National Recreation Area. Scale [ca. 150,000]. [Washington, D.C.?]: U.S. Forest Service, 1981.

MLA (9th ed.) Citation

United States. Forest Service. Trinity Unit, Whiskeytown-Shasta-Trinity National Recreation Area. Scale [ca. 150,000]. U.S. Forest Service, 1981.