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1. Illinois, Equality quadrangle : topography Illinois, Equality quadrangle : topography Illinois; Maps; Topographic maps; Topography; Equality (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1913-1914."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois."; Coordinates (W 88⁰30’00"--W 88⁰15’00"/N...

2. Fairfield quadrangle, Illinois : 15 minute series (topographic) Fairfield quadrangle, Illinois : 15 minute series (topographic) Illinois; Maps; Topographic maps; Topography; Fairfield (Ill.) Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods 1946."; Contour interval 20 feet.; Coordinates (W...

3. Shawneetown quadrangle, Illinois-Kentucky : 15 minute series (topographic) Shawneetown quadrangle, Illinois-Kentucky : 15 minute series (topographic) Shawneetown; Kentucky; Maps; Topographic maps; Topography; Illinois Relief shown by contours and spot heights.; "Topography from aerial photographs by photogrammetric methods and by planetable surveys. Aerial photographs taken 1957"; "Contour interval 20 feet."; Coordinates:...
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