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1. Maroa quadrangle, Illinois : 15 minute series (topographic). Maroa quadrangle, Illinois : 15 minute series (topographic). Maroa, Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Topography from aerial photographs by Kelsh plotter and by planetable surveys 1956-1957. Aerial photographs taken 1956."; "Contour interval 10 feet."; Coordinates:...

2. McLean quadrangle, Illinois : 15 minute series (topographic) McLean quadrangle, Illinois : 15 minute series (topographic) McLean (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1940-1941. Topography by plane-table methods, 1926, 1930, 1945, and 1949."; "Contour interval...

3. Illinois, Havana quadrangle Illinois, Havana quadrangle Illinois; Maps; Topographic maps; Topography; Havana (Ill.) Relief shown by contours and spot heights.; "Control in part by Illinois River Commission and Corps of Engineers U.S. Army."; "Surveyed in 1922-1923."; "Contour interval 20 feet." Coordinates: (W 90⁰15ʹ00ʺ--W...

4. Illinois, Potomac quadrangle. Illinois, Potomac quadrangle. Potomac (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1931-1932"; "Contour interval 10 feet"; Shows roadway classification as of 1934.; (W 88⁰00ʹ00ʺ--W 87⁰45ʹ00ʺ/N 40⁰30ʹ00ʺ--N 40⁰15ʹ00ʺ)...

5. Illinois, Colchester quadrangle : topography Illinois, Colchester quadrangle : topography Illinois; Maps; Topographic maps; Topography; Colchester (Ill.) Relief shown by contours.; "Contour interval 20 feet."; "Surveyed in 1911."; Coordinates: (W 91⁰00ʹ00ʺ--W 90⁰45ʹ00ʺ/N 40⁰30ʹ00ʺ--N 40⁰15ʹ00ʺ)

6. Illinois, Mackinaw quadrangle Illinois, Mackinaw quadrangle Illinois; Maps; Topographic maps; Topography; Mackinaw (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1927-1928"; "Contour interval 10 feet"; Shows roadway classification as of 1931.; Coordinates: (W 89⁰30ʹ00ʺ--W 89⁰15ʹ00ʺ/N 40⁰45ʹ00ʺ--N...

7. 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:...

8. Illinois, Virginia quadrangle Illinois, Virginia quadrangle Maps; Topographic maps; Topography; Illinois; Virginia (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1928 and 1932."; "Contour interval 10 feet."; Shows roadway classification as of 1935.; Coordinates: (W 90⁰15ʹ00ʺ--W 90⁰00ʹ00ʺ/N 40⁰00ʹ00ʺ--N...
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