1. Preliminary post route map of the territories of Montana, Idaho, Wyoming, Utah, Arizona, New Mexico Creator: Nicholson, W. L Published / Created: 19--?] Call Number: 80gmd 1878 Container / Volume: BRBL_00538 Image Count: 6 Resource Type: Maps, Atlases & Globes Found in: Beinecke Rare Book and Manuscript Library > 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