Cite

Highway map of Washington & Oregon / maps prepared by Progressive Map Service, Fresno, California ; compliments of Standard Oil Company, California.

MLA

Service, Progressive Map. Highway Map of Washington & Oregon / Maps Prepared by Progressive Map Service, Fresno, California ; Compliments of Standard Oil Company, California. [Standard Oil Company?], 0AD. https://collections.library.yale.edu/catalog/15821696.

APA, 6th edition

Service, P. M. (0 C.E.). Highway map of Washington & Oregon / maps prepared by Progressive Map Service, Fresno, California ; compliments of Standard Oil Company, California. [Road maps]. [Standard Oil Company?], https://collections.library.yale.edu/catalog/15821696.