Cite

National Highways preliminary map of the state of Colorado : showing thirty-five hundred miles of national highways / proposed by the National Highways Association.

MLA

Association, National Highways. National Highways Preliminary Map of the State of Colorado : Showing Thirty-Five Hundred Miles of National Highways / Proposed by the National Highways Association. The Association, 1916. https://collections.library.yale.edu/catalog/15818463.

APA, 6th edition

Association, N. H. (1916). National Highways preliminary map of the state of Colorado : showing thirty-five hundred miles of national highways / proposed by the National Highways Association. [Road maps]. The Association, https://collections.library.yale.edu/catalog/15818463.