| 1. |  | Iowa-Illinois, Muscatine quadrangle : 15-minute series. | Muscatane (Ill.); Iowa; Illinois; Maps; Topographic maps; Topography | 1 map : col.; Relief shown by contours and spot heights.; "Mapped by the Geological Survey 1946"; "Contour interval 20 feet."; Shows roadway classification as of 1947.; Coordinates: (W 91⁰15ʹ00ʺ--W... |
