| 1. ||Illinois (Jo Daviess County), Elizabeth quadrangle : topography ||Illinois; Maps; Topographic maps; Topography; Elizabeth (Ill.); Jo Daviess County (Ill.) ||1 map : col.; Relief indicated by contours and spot heights.; "Surveyed in 1909."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois."