Report of the survey of traffic on Illinois state highways :
August 1931 to Labor Day 1932.
APA Citation
Illinois. Division of Highways. (1932). Report of the survey of traffic on Illinois state highways: August 1931 to Labor Day 1932. Ottawa, Ill.: Illinois Office Supply Co..
MLA Citation
Illinois. Division of Highways. Report of the Survey of Traffic On Illinois State Highways: August 1931 to Labor Day 1932. Ottawa, Ill.: Illinois Office Supply Co., 1932.
Warning: These citations may not always be complete (especially for serials).