Preliminary post route map of the territories of Montana, Idaho, Wyoming, Utah, Arizona, New Mexico and state of Colorado, with parts of adjacent states and territories / designed and constructed under the orders of D.M. Key by W.L. Nicholson of P.O. Dept
MLA
Nicholson, W. L. Preliminary Post Route Map of the Territories of Montana, Idaho, Wyoming, Utah, Arizona, New Mexico and State of Colorado, with Parts of Adjacent States and Territories / Designed and Constructed under the Orders of D.M. Key by W.L. Nicholson of P.O. Dept. s.n., 19AD. https://collections.library.yale.edu/catalog/15813004.
APA, 6th edition
Nicholson, W. L. (19 C.E.). Preliminary post route map of the territories of Montana, Idaho, Wyoming, Utah, Arizona, New Mexico and state of Colorado, with parts of adjacent states and territories / designed and constructed under the orders of D.M. Key by W.L. Nicholson of P.O. Dept [Maps]. s.n., https://collections.library.yale.edu/catalog/15813004.
