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1. Illinois, Equality quadrangle : topography Illinois, Equality quadrangle : topography Illinois; Maps; Topographic maps; Topography; Equality (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1913-1914."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois."; Coordinates (W 88⁰30’00"--W 88⁰15’00"/N...

2. Illinois, Orion quadrangle. Illinois, Orion quadrangle. Orion (Ill.); Illinois; Maps; Topographic maps; Topography 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 1930-1932"; "Contour interval 20 feet."

3. Illinois, Prophetstown quadrangle. Illinois, Prophetstown quadrangle. Prophetstown (Ill.); Illinois; Maps; Topographic maps; Topography 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 1928 and 1931-1932"; "Contour interval 10 feet";...

4. Illinois, Decatur quadrangle Illinois, Decatur quadrangle Illinois; Maps; Topographic maps; Topography; Decatur (Ill.) Relief shown by contours and spot heights.; "Contour interval 10 feet"; "Surveyed in 1929"; Shows roadway classification as of 1932.; Coordinates: (W 89⁰00ʹ00ʺ--W 88⁰45ʹ00ʺ/N 40⁰00ʹ00ʺ--N 39⁰45ʹ00ʺ)...

5. Illinois (Henry County) Geneseo quadrangle Illinois (Henry County) Geneseo quadrangle Illinois; Maps; Topographic maps; Topography; Geneseo (Ill.); Henry County (Ill.) "Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army."; "Surveyed in 1931 and 1932."; Contour interval 10 feet. Coordinates: (W 90⁰15’00"--W 90⁰00’00"/N...

6. Illinois, Morrison quadrangle Illinois, Morrison quadrangle Morrison (Ill.); Illinois; Maps; Topographic maps; Topography 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 1927 and 1933-1934."; Shows roadway classification...
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