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1. Le Roy quadrangle, Illinois : 15 minute series (topographic) Le Roy quadrangle, Illinois : 15 minute series (topographic) Illinois; Maps; Topographic maps; Topography; Le Roy (Ill.) Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1940. Topography by plane-table surveys 1930 and 1950-1951"; "Contour interval 10 feet."...

2. Minier quadrangle, Illinois : 15 minute series (topographic) Minier quadrangle, Illinois : 15 minute series (topographic) Minier (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1939. Topography by plane-table methods 1930 and 1950-1951. Field check 1951"; "Contour...

3. Mechanicsburg quadrangle, Illinois : 15 minute series (topographic). Mechanicsburg quadrangle, Illinois : 15 minute series (topographic). Mechanicsburg (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1950-1951. Topography by plane-table surveys 1954"; "Contour interval 10 feet."
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