1. 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 Yale Public content 1924. 2021-08-23T19:16:27Z. 2021-08-27T21:35:55Z. Published under the direction of the National Highways Association,A. Hoen & Co. English. cartographic image. Public. Yellowstone Trail, United States, and United States.