1971 Official Highway Map

Chicago citation style
Illinois. Division of Highways. 1971 Official Highway Map. 1971. Retrieved from the Digital Public Library of America, http://www.idaillinois.org/cdm/ref/collection/isl9/id/138. (Accessed November 24, 2020.)
APA citation style
Illinois. Division of Highways, (1971) 1971 Official Highway Map. Retrieved from the Digital Public Library of America, http://www.idaillinois.org/cdm/ref/collection/isl9/id/138
MLA citation style
Illinois. Division of Highways. Retrieved from the Digital Public Library of America <http://www.idaillinois.org/cdm/ref/collection/isl9/id/138>.
Note: These citations are programmatically generated and may be incomplete.