Iowa. State Planning Board. Committee on TransportationIowa state plan. "Project 1036." "1036-5."1 map : black line ; 83 x 114 cmJPEG2000706114100; MAPG4151_P22_193_I6.jp2islandora: testiadep_1830https://digital.lib.uiowa.edu/node/358794engUniversity of Northern IowaPublicInterstate truck lines: concentration of through truck traffic on cross state highwaysMapsIowa1930-1940University of Iowa