Post Route Map of the States of Montana, Idaho, and Wyoming, showing post offices with the intermediate distances on mail routes in operation on the 1st of January, 1917. 1 inch to ca. Frequency and types of mail service, discontinued post offices, counties, towns, railroads, physical features, and parts of adjoining States. Edition of June 30, 1918. 1 inch to 24 miles.
Areas designated are shaded red.
Shows public land surveys. Special Published, Montana 14. 514. Edition of June 30, 1920. 1 inch to 24 miles. Areas designated are shaded red.