State Highway Department's official automobile road map of the state of Oregon showing all through trunk highways and main traveled roads, with mileages / State Highway Department.
MLA
Dept, Oregon. State Highway. State Highway Department's Official Automobile Road Map of the State of Oregon Showing All through Trunk Highways and Main Traveled Roads, with Mileages / State Highway Department. Oregon State Highway Commission, 1921. https://collections.library.yale.edu/catalog/15952283.
APA, 6th edition
Dept, O. S. H. (1921). State Highway Department's official automobile road map of the state of Oregon showing all through trunk highways and main traveled roads, with mileages / State Highway Department. [Road maps]. Oregon State Highway Commission, https://collections.library.yale.edu/catalog/15952283.
