Map of the Yellowstone Trail : "a good road from Plymouth Rock to Puget Sound, showing every city, town, village and hamlet throughout its entire length and connections with a 150,000-mile system of national highways proposed by the Yellowstone Trail Association ; a transcontinental highway to be built and forever maintained by the United States government ; also advocated by the National Highways Association
Publisher:
Published under the direction of the National Highways Association,A. Hoen & Co.