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1. Illinois, Mount Olive quadrangle : topography. Illinois, Mount Olive quadrangle : topography. Mount Olive (Ill.); Illinois; Maps; Topographic maps; Topography Relief indicated by contours and spot heights.; "Surveyed in 1913"; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."; Coordinates: (W 89⁰45ʹ00ʺ--W 89⁰30ʹ00ʺ/N...

2. 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)...

3. 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...

4. Missouri-Illinois, Hannibal quadrangle Missouri-Illinois, Hannibal quadrangle Illinois; Maps; Topographic maps; Topography; Hannibal (Mo.); Missouri 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 and 1928."; "Contour interval 20 feet."; Coordinates:...

5. 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:...

6. Illinois-Wisconsin, Pecatonica quadrangle. Illinois-Wisconsin, Pecatonica quadrangle. Pecatonica (Ill.); Illinois; Wisconsin; Maps; Topographic maps; Topography "Contour interval 10 feet"; "Surveyed in 1915 and 1931-1932"; Shows roadway classification as of 1935.; Coordinates: (W 89⁰30’00"--W 89⁰15’00"/N 42⁰30’00"--N 42⁰15’00")

7. 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...

8. Illinois-Indiana, Carmi quadrangle : 15-minute series Illinois-Indiana, Carmi quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Carmi; Indiana Relief shown by contours and spot heights.; "Surveyed in 1921 and 1939-1940."; "Topography in Indiana from chart of the Wabash River by Corps of Engineers, U.S. Army."; "Contour interval 10 feet."; Coordinates:...

9. Kentucky-Illinois Golconda quadrangle : topography Kentucky-Illinois Golconda quadrangle : topography Illinois; Maps; Topographic maps; Topography; Golconda; Kentucky Relief shown by contours and spot heights.; "Surveyed in 1914, 1916 and 1920."; "Surveyed in cooperation with the States of Kentucky and Illinois."; "Contour interval 20 feet."; Coordinates: (W 88⁰30ʹ00ʺ--W...

10. Illinois Hardinville quadrangle : topography Illinois Hardinville quadrangle : topography Illinois; Maps; Topographic maps; Topography; Hardinville (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1907-1908."; "Surveyed in cooperation with the State of Illinois."; Coordinates: (W 88⁰00ʹ00ʺ--W 87⁰45ʹ00ʺ/N 39⁰00ʹ00ʺ--N 38⁰45ʹ00ʺ)...

11. Illinois, Ina quadrangle : 15-minute series Illinois, Ina quadrangle : 15-minute series Illinois ; Maps ; Topographic maps ; Topography ; Ina (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1921, 1930, and 1937-1939."; "Contour interval 10 feet."; Road classification as of 1942.; Coordinates: (W 89⁰00ʹ00ʺ--W 88⁰45ʹ00ʺ/N 38⁰15ʹ00ʺ--N...

12. 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...

13. Illinois, Tallula quadrangle : topography Illinois, Tallula quadrangle : topography Maps; Topographic maps; Topography; Illinois; Tallula (Ill.) Relief indicated by contours and spot heights.; "Surveyed in 1906-1907."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 10 feet."; Coordinates: (W 90⁰00ʹ00ʺ--W 89⁰45ʹ00ʺ/N...

14. Illinois (Warren County), Monmouth quadrangle Illinois (Warren County), Monmouth quadrangle Monmouth (Ill.); Warren County (Ill.); Illinois; Maps; Topographic maps; Topography "Contour interval 20 feet."; "Surveyed in 1920-1921."; "Surveyed in cooperation with the State of Illinois." Coordinates: (W 90⁰45ʹ00ʺ--W 90⁰30ʹ00ʺ/N 41⁰00ʹ00ʺ--N 40⁰45ʹ00ʺ)

15. 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...

16. llinois, Greenup quadrangle : 15-minute series. llinois, Greenup quadrangle : 15-minute series. Illinois; Maps; Topographic maps; Topography; Greenup (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1929 and 1939-1940"; "Contour interval 10 feet."; Shows roadway classification as of 1942.; Coordinates: (W 88⁰15ʹ00ʺ--W 88⁰00ʹ00ʺ/N 39⁰15ʹ00ʺ--N...

17. 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...

18. Illinois, Lena quadrangle : 15-minute series Illinois, Lena quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Lena (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1909, 1922, 1936, 1937 and 1942"; "Contour interval 20 feet"; Shows roadway classification as of 1942.; Coordinates: (W 90⁰00ʹ00ʺ--W 89⁰45ʹ00ʺ/N...

19. Indiana-Illinois, Vincennes quadrangle : topography Indiana-Illinois, Vincennes quadrangle : topography Maps; Topographic maps; Topography; Illinois; Indiana; Vincennes (Ind.) Relief shown by contours and spot heights.; "Surveyed in 1911-1913."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."; Coordinates: (W 87⁰45ʹ00ʺ--W 87⁰30ʹ00ʺ/N...

20. 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:...
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