Blue Mountain recreation area, southeastern Washington, northeastern Oregon : 1949 / map prepared especially by Northwest Mapping Service, Seattle for Walla Walla Chamber of Commerce as a district development activity.
MLA
Service, Northwest Mapping. Blue Mountain Recreation Area, Southeastern Washington, Northeastern Oregon : 1949 / Map Prepared Especially by Northwest Mapping Service, Seattle for Walla Walla Chamber of Commerce as a District Development Activity. Walla Walla Chamber of Commerce, 0AD. https://collections.library.yale.edu/catalog/15813003.
APA, 6th edition
Service, N. M. (0 C.E.). Blue Mountain recreation area, southeastern Washington, northeastern Oregon : 1949 / map prepared especially by Northwest Mapping Service, Seattle for Walla Walla Chamber of Commerce as a district development activity. [Maps]. Walla Walla Chamber of Commerce, https://collections.library.yale.edu/catalog/15813003.
