City and metropolitan Walla Walla, Walla Walla County, Washington / map prepared especially by Northwest Mapping Service, Seattle for Walla Walla Chamber of Commerce.
MLA
Service, Northwest Mapping. City and Metropolitan Walla Walla, Walla Walla County, Washington / Map Prepared Especially by Northwest Mapping Service, Seattle for Walla Walla Chamber of Commerce. Northwest Mapping Service, 1949. https://collections.library.yale.edu/catalog/15821675.
APA, 6th edition
Service, N. M. (1949). City and metropolitan Walla Walla, Walla Walla County, Washington / map prepared especially by Northwest Mapping Service, Seattle for Walla Walla Chamber of Commerce. [Maps]. Northwest Mapping Service, https://collections.library.yale.edu/catalog/15821675.
