Geological Survey (U.S.)Contour interval 20 feet.;"Mapped by the Geological Survey 1946"; (W 91⁰15ʹ00ʺ--W 91⁰00ʹ00ʺ/N 41⁰30ʹ00ʺ--N 41⁰15ʹ00ʺ);Relief shown by contours and spot heights.;Shows roadway classification as of 1947.;1 map, colored;45 x 34 cm.;1:62,500JPEG2000https://digital.library.illinois.edu/items/a3d857c0-994e-0134-2096-0050569601ca-4engGeological Survey (U.S.)Geological Survey Division (Urbana, Ill.)PublicIowa-Illinois, Muscatine quadrangle : 15-minute series.MapsIllinoisIowa1948University of Illinois Urbana-Champaign