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1. Illinois and Michigan Canal (Ill.) Illinois and Michigan Canal (Ill.) Maps Map and profile of the proposed route for the Michigan and Illinois Canal, surveyed in 1830 by W.B. Guion & H. Belin, civil engineers, reduced from the original drawing by J.R. Irwin, Lieut., U.S.A. S.l.:...
2. Illinois, Newton quadrangle : 15-minute series. Illinois, Newton quadrangle : 15-minute series. Newton (Ill.); Illinois; Maps; Topographic maps; Topography 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1941."; "Contour interval 10 feet."
3. Illinois, Enfield quadrangle : 15-minute series Illinois, Enfield quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Enfield (Ill.) 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1921 and 1941"; "Contour interval 10 feet"; Road classification as of 1943.
4. Missouri-Illinois, Charleston quadrangle : grid zone 'C' Missouri-Illinois, Charleston quadrangle : grid zone 'C' Illinois; Maps; Topographic maps; Topography; Charleston (Mo.); Missouri 1 map : col.; Relief shown by contours and spot heights.; "Topography by Corps of Engineers...1930-39. Revised...1932, 1935 and 1939."; "Contour interval 5 feet."
5. Amboy quadrangle, Illinois : 15 minute series (topographic) Amboy quadrangle, Illinois : 15 minute series (topographic) Illinois; Maps; Topographic maps; Topography; Amboy (Ill.) 1 map : col.; 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...
6. Missouri-Illinois-Kentucky, Wickliffe quadrangle : grid zone 'C' Missouri-Illinois-Kentucky, Wickliffe quadrangle : grid zone 'C' Maps; Topographic maps; Topography; Illinois; Kentucky; Missouri; Wickliffe 1 map : col.; Relief shown by contours and spot heights.; "Topography by Corps of Engineers...1930-39. Revised by Mississippi River Commission, 1932, 1935 and 1939."; "Contour interval 5 feet."
7. Iowa-Illinois Miles quadrangle Iowa-Illinois Miles quadrangle Miles; Iowa; Illinois; Maps; Topographic maps; Topography 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1935."; "Contour interval 20 feet."; Shows roadway classification as of 1940.
8. Walnut quadrangle, Illinois : 15 minute series (topographic) Walnut quadrangle, Illinois : 15 minute series (topographic) Maps; Topographic maps; Topography; Illinois; Walnut (Ill.) 1 map : col.; 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...
9. Illinois-Iowa, Keithsburg quadrangle Illinois-Iowa, Keithsburg quadrangle Illinois; Maps; Topographic maps; Topography; Keithsburg; Iowa 1 map : col.; Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army."; "Surveyed in 1921, 1931, 1934, and 1935"; "Contour...
10. Illinois (Knox County), Maquon quadrangle : 15-minute series Illinois (Knox County), Maquon quadrangle : 15-minute series Maquon (Ill.); Knox County (Ill.); Maps; Topographic maps; Topography; Illinois 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1930 and 1941"; "Contour interval 20 feet."
11. Mendota quadrangle, Illinois : 15 minute series (topographic). Mendota quadrangle, Illinois : 15 minute series (topographic). Mendota (Ill.); Illinois; Maps; Topographic maps; Topography 1 map : col.; Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1939, 1941 and 1951. Topography by plane-table surveys 1952"; "Contour interval...
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