APA (7th ed.) Citation

Ingalls, R., & Scholl, L. (1975). [Map without title of routes West of South Pass, to Fort Vancouver, Benecia and Fort Reading]. U.S. Army Corps of Engineers.

Chicago Style (17th ed.) Citation

Ingalls, R., and L. Scholl. [Map Without Title of Routes West of South Pass, to Fort Vancouver, Benecia and Fort Reading]. [Washington, D.C.?]: U.S. Army Corps of Engineers, 1975.

MLA (9th ed.) Citation

Ingalls, R., and L. Scholl. [Map Without Title of Routes West of South Pass, to Fort Vancouver, Benecia and Fort Reading]. U.S. Army Corps of Engineers, 1975.