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1. Sandwich quadrangle, Illinois : 15 minute series (topographic) Sandwich quadrangle, Illinois : 15 minute series (topographic) Sandwich (Ill.); Maps; Topographic maps; Topography; Illinois Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1939. Topography by plane-table methods 1948"; "Contour interval 10 feet."

2. Tuscola quadrangle, Illinois : 15 minute series (topographic) Tuscola quadrangle, Illinois : 15 minute series (topographic) Maps; Topographic maps; Topography; Illinois; Tuscola (Ill.); Douglas County (Ill.) Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1948. Topography by plane-table methods 1935 and 1950."; "Contour interval 10 feet."

3. Dwight quadrangle, Illinois : 15 minute series (topographic) Dwight quadrangle, Illinois : 15 minute series (topographic) Illinois; Maps; Topographic maps; Topography; Dwight (Ill.) Relief shown by contours and spot heights.; "Contour interval 10 feet"; "Culture and drainage in part compiled from aerial photographs taken 1948. Topography by plane-table methods 1948."

4. Niantic quadrangle, Illinois : 15 minute series (topographic). Niantic quadrangle, Illinois : 15 minute series (topographic). Niantic (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1950. Topography by plane-table surveys 1954."; "Contour interval 10 feet."; Coordinates:...

5. Assumption quadrangle, Illinois : 15 minute series (topographic) Assumption quadrangle, Illinois : 15 minute series (topographic) Illinois; Maps; Topographic maps; Topography; Assumption (Ill.) Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1950. Topography by plane-table surveys 1945 and 1951-1952."; Includes quadrangle location...

6. Wisconsin-Illinois, South Wayne quadrangle Wisconsin-Illinois, South Wayne quadrangle South Wayne; Wisconsin; Maps; Topographic maps; Topography; Illinois Relief shown in contours.; "Surveyed in 1921."; "Contour interval 20 feet."
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