| 1. |  | Illinois Hardinville quadrangle : topography | Illinois; Maps; Topographic maps; Topography; Hardinville (Ill.) | 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1907-1908."; "Surveyed in cooperation with the State of Illinois."; Coordinates: (W 88⁰00ʹ00ʺ--W 87⁰45ʹ00ʺ/N 39⁰00ʹ00ʺ--N... |
