Thomas, Cowperthwait & Co.1 map : colorScale approximately 1:1,805,760W 97°00′--W 89°07′/N 44°30′--N 39°46′JPEGui:sheetmaps_14engThomas, Cowperthwait & Co.PublicA new map of the state of Iowa, 1850MapsIowa1850-1860University of Iowa