APA (7th ed.) Citation

United States. Forest Service. (1936). Forest trees and forest regions of United States. [s.n.].

Chicago Style (17th ed.) Citation

United States. Forest Service. Forest Trees and Forest Regions of United States. [Washington]: [s.n.], 1936.

MLA (9th ed.) Citation

United States. Forest Service. Forest Trees and Forest Regions of United States. [s.n.], 1936.

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