Goldthwait's map of the United States & Canada : exhibiting the railroads with their distances, single and double tracks and width of gauge, and the time compared with noon at Washington & Greenwich / by J.H. Goldthwait.
MLA
Goldthwait, J. H. Goldthwait's Map of the United States & Canada : Exhibiting the Railroads with Their Distances, Single and Double Tracks and Width of Gauge, and the Time Compared with Noon at Washington & Greenwich / by J.H. Goldthwait. G.Q. Colton, 1861. https://collections.library.yale.edu/catalog/15536503.
APA, 6th edition
Goldthwait, J. H. (1861). Goldthwait's map of the United States & Canada : exhibiting the railroads with their distances, single and double tracks and width of gauge, and the time compared with noon at Washington & Greenwich / by J.H. Goldthwait. [Maps]. G.Q. Colton, https://collections.library.yale.edu/catalog/15536503.