Geological Survey (U.S.)1 mapScale 1:24,000Polyconic projectionW 91°35′ --W 91°30′ /N 41°41′ 15″--N 41°37′ 30″JPEGui:sheetmaps_189engU.S. Geological SurveyPublicIowa City and vicinity, Iowa, 1931MapsIowa--Johnson CountyIowa--Iowa CityIowa1930-1940University of Iowa