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1. Illinois, Newton quadrangle : 15-minute series. Illinois, Newton quadrangle : 15-minute series. Newton (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1941."; "Contour interval 10 feet."

2. Amboy quadrangle, Illinois : 15 minute series (topographic) Amboy quadrangle, Illinois : 15 minute series (topographic) Illinois; Maps; Topographic maps; Topography; Amboy (Ill.) Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1939 and 1941. Topography by plane-table surveys 1951."; "Contour interval 10 feet."

3. Walnut quadrangle, Illinois : 15 minute series (topographic) Walnut quadrangle, Illinois : 15 minute series (topographic) Maps; Topographic maps; Topography; Illinois; Walnut (Ill.) Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1937, 1939 and 1941. Topography by plane-table methods, 1947."; "Contour interval 10 feet."...
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