| 1. |  | Illinois-Missouri, Campbell Hill quadrangle : topography | Illinois; Maps; Topographic maps; Topography; Campbell Hill; Missouri | 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1915-1916."; "Surveyed in cooperation with the States of Illinois and Missouri."; "Contour interval 20 feet."; Coordinates: (W 89⁰45ʹ00ʺ--W... |
