Niagara Falls [map] : from surveys executed under the orders of Major C.B. Comstock, Corp of Engineers, Brvt. Brigadier General USA / survey made by Assistant Engineer F.M. Towar July and August 1875 and drawn by Asst. Engineer C. Donovan.
MLA
Towar, F. M. Niagara Falls [Map] : from Surveys Executed under the Orders of Major C.B. Comstock, Corp of Engineers, Brvt. Brigadier General USA / Survey Made by Assistant Engineer F.M. Towar July and August 1875 and Drawn by Asst. Engineer C. Donovan. Corps of Engineers, War Dept., 1875. https://collections.library.yale.edu/catalog/15761169.
APA, 6th edition
Towar, F. M. (1875). Niagara Falls [map] : from surveys executed under the orders of Major C.B. Comstock, Corp of Engineers, Brvt. Brigadier General USA / survey made by Assistant Engineer F.M. Towar July and August 1875 and drawn by Asst. Engineer C. Donovan. [Maps]. Corps of Engineers, War Dept., https://collections.library.yale.edu/catalog/15761169.
