| 1. |  | llinois, Greenup quadrangle : 15-minute series. | Illinois; Maps; Topographic maps; Topography; Greenup (Ill.) | 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1929 and 1939-1940"; "Contour interval 10 feet."; Shows roadway classification as of 1942.; Coordinates: (W 88⁰15ʹ00ʺ--W 88⁰00ʹ00ʺ/N... |
