G.W. & C.B. Colton & Co.1 mapTIFF7181221file name: 31858062319359.tifbarcode: 31858062319359islandora: sheetmaps_36(OCoLC)60193860https://digital.lib.uiowa.edu/node/700139engG.W. & C.B. Colton & Co.PublicMap of the central portion of the United States showing the lines of the proposed Pacific railroads, 1864MapsIowa1860-1870University of Iowa