Freeway and expressway system, Portland Metropolitan Area, 1955 / Oregon State Highway Department, Traffic Engineering Division, Planning Survey Section, in cooperation with the U.S. Dept. of Commerce, Bureau of Public Roads.
- Salem, Or. : Oregon State Highway Commission, 
151 p. : ill., maps (some colored), plans ; 28 x 39 cm.
- Technical report / Oregon State Highway Department ; no. 55-5