United States. Bureau of Public RoadsBase map from U.S. Geological Survey State Map.; "Published in accordance with Act of Congress approved Nov. 9, 1921, creating the Federal Aid Highway System."; "Data corrected to Dec. 31, 1927."; "Approved Federal Aid Mileage Iowa ... 7,212.00."sheets 79 x 56 centimetersJPEGUMN_ALMA:9948676220001701engBureau of Public Roads (Washington, D.C)PublicThe Federal aid highway system progress map : [Iowa]MapsIowa1927University of Minnesota