Cite

Montana Territory

MLA

United States. War Department. Corps of Engineers, cartographer, and publisher. Montana Territory. Corps of Engineers?, 0AD. https://collections.library.yale.edu/catalog/32491943.

APA, 6th edition

United States. War Department. Corps of Engineers, cartographer, & publisher. (0 C.E.). Montana Territory [Maps]. Corps of Engineers? https://collections.library.yale.edu/catalog/32491943.