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.
Source: Yale University. W.L. Nicholson, 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. Available at https://collections.library.yale.edu/catalog/15813004.Download Original File
Source
Yale University. W.L. Nicholson, 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. Available at https://collections.library.yale.edu/catalog/15813004.
"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." appears in: Curtis Edwin Bolton, Founder of Boltonheim, Utah
