| 1. |  | Kentucky-Illinois Golconda quadrangle : topography | Illinois; Maps; Topographic maps; Topography; Golconda; Kentucky | 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1914, 1916 and 1920."; "Surveyed in cooperation with the States of Kentucky and Illinois."; "Contour interval 20 feet."; Coordinates:... |
