| 1. |  | Illinois, Lena quadrangle : 15-minute series | Illinois; Maps; Topographic maps; Topography; Lena (Ill.) | 1 map : col. ; Relief shown by contours and spot heights.; "Surveyed in 1909, 1922, 1936, 1937 and 1942"; "Contour interval 20 feet"; Shows roadway classification as of 1942.; Coordinates: (W 90⁰00ʹ00ʺ--W... |
