1. National highways map of the state of Rhode Island showing two hundred miles of national highways proposed by the National Highways Association Maps University Of Minnesota Public content 1914. National Highways Association. Includes information on the population to be served and other notes. "June 1914." "Copyrighted October, 1915 by ..." 30 x 18 centimeters Scale ... National Highways Association (Washington, D.C.), 1915.