1. Map of the Old Spanish Trail, Florida to California : showing every city, town, village and hamlet throughout its entire length and connections with a 150,000-mile system of nations highways : proposed by the Old Spanish Trail Association as a transcontinental highway to be built and forever maintained by the United States government and also advocated by the National Highways Association, Washington, D.C. Yale Public content 1923. 2021-08-06T13:32:02Z. 2021-08-27T21:35:12Z. Mulford, John C., cartographer. National Highways Association,A. Hoen & Co. English. cartographic image,still image. Public. Old Spanish Trail, United States, United States., and Old Spanish Trail.