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1. 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...

2. Illinois (Bureau County), Buda quadrangle : topography Illinois (Bureau County), Buda quadrangle : topography Illinois; Maps; Topographic maps; Topography; Buda (Ill.); Bureau County (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1921."; Contour interval 20 feet.

3. Illinois-Indiana, Birds quadrangle : topography Illinois-Indiana, Birds quadrangle : topography Illinois; Maps; Topographic maps; Topography; Birds (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1914."; "Surveyed in cooperation with the State of Illinois."

4. Illinois (Iroquois County), Cissna Park quadrangle Illinois (Iroquois County), Cissna Park quadrangle Illinois; Maps; Topographic maps; Topography; Cissna Park (Ill.); Iroquois County (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1939."; "Contour interval 10 feet."

5. Illinois (Hancock County), Carthage quadrangle Illinois (Hancock County), Carthage quadrangle Illinois; Maps; Topographic maps; Topography; Carthage (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1921-1922 and 1931-1933."; "Contour interval 10 feet."; Shows roadway classification as of 1936.

6. Illinois, Greenville quadrangle : 15-minute series Illinois, Greenville quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Greenville (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1928 and 1938-1939"; "Contour interval 10 feet."; Shows roadway classification as of 1942.

7. Illinois, Mt. Carroll quadrangle : 15-minute series. Illinois, Mt. Carroll quadrangle : 15-minute series. Mount Carroll (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1939, 1940, and 1942"; "Contour interval 20 feet"; Road classification as of 1943.

8. 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...

9. 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")

10. 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...

11. 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)

12. 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...

13. 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...

14. Illinois, Oregon quadrangle. Illinois, Oregon quadrangle. Oregon (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1921-1922"; "Contour interval 20 feet."; Coordinates: (W 89⁰30ʹ00ʺ--W 89⁰15ʹ00ʺ/N 42⁰15ʹ00ʺ--N 42⁰00ʹ00ʺ)

15. Illinois-Wisconsin, McHenry quadrangle Illinois-Wisconsin, McHenry quadrangle Illinois; Maps; Topographic maps; Topography; McHenry (Ill.) Relief shown by contours and spot heights.; "Control in part from railroad valuation surveys, Surveyed in 1924"; "Contour interval 10 feet."

16. Illinois-Iowa-Missouri, Keokuk quadrangle Illinois-Iowa-Missouri, Keokuk quadrangle Illinois; Maps; Topographic maps; Topography; Keokuk; 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, 1928 and 1932"; "Contour intervals 10 and 20...
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