Map of the Country between Washington & Pittsburg referring to the contemplated Chesapeake & Ohio Canal and its general route and profile. Oct. 1826. Drawn by Lieut. Farley, U.S.A. Etched by Wm. Harrison, Georgetown, D.C., Lettered by D.R. Harrison.
MLA
Map of the Country between Washington & Pittsburg Referring to the Contemplated Chesapeake & Ohio Canal and Its General Route and Profile. Oct. 1826. Drawn by Lieut. Farley, U.S.A. Etched by Wm. Harrison, Georgetown, D.C., Lettered by D.R. Harrison. U.S. War Dept., Corps of Engineers, 1826. https://collections.library.yale.edu/catalog/15604197.
APA, 6th edition
Map of the Country between Washington & Pittsburg referring to the contemplated Chesapeake & Ohio Canal and its general route and profile. Oct. 1826. Drawn by Lieut. Farley, U.S.A. Etched by Wm. Harrison, Georgetown, D.C., Lettered by D.R. Harrison. (1826). [Maps]. U.S. War Dept., Corps of Engineers, https://collections.library.yale.edu/catalog/15604197.