Colton's railroad and express map of the northwestern states : showing the counties, towns, railroads, station, distances, etc.
MLA
G. W., et al. Colton's Railroad and Express Map of the Northwestern States : Showing the Counties, Towns, Railroads, Station, Distances, Etc. G.W. & C.B. Colton, 1872. https://collections.library.yale.edu/catalog/15813018.
APA, 6th edition
G. W., Colton, C. B., & C. (1872). Colton's railroad and express map of the northwestern states : showing the counties, towns, railroads, station, distances, etc. [Maps]. G.W. & C.B. Colton, https://collections.library.yale.edu/catalog/15813018.