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1. 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...

2. Illinois-Missouri, Pearl quadrangle. Illinois-Missouri, Pearl quadrangle. Pearl (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"; "Contour interval 20 feet"; "Surveyed in 1926-1927"; Shows roadway...

3. Illinois, Monticello quadrangle : 15 minute series. Illinois, Monticello quadrangle : 15 minute series. Monticello (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1936 and 1937, Culture revised in part, 1942"; "Contour interval 10 feet."

4. 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...

5. 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...

6. Illinois, Hennepin sheet Illinois, Hennepin sheet Illinois; Maps; Topographic maps; Topography; Hennepin (Ill.) Relief indicated by contours.; "Surveyed in 1891."; "Contour interval 10 feet"

7. Illinois, Des Plaines sheet Illinois, Des Plaines sheet Illinois; Maps; Topographic maps; Topography; Des Plaines (Ill.) Relief indicated by contours.; "Surveyed in 1889-90."; "Contour interval 10 feet."

8. Illinois, Lacon sheet Illinois, Lacon sheet Illinois; Maps; Topographic maps; Topography; Lacon (Ill.) Relief indicated by contours.; "Surveyed in 1891."; "Contour interval 20 feet."

9. Illinois (Iroquois county), Gilman quadrangle : 15-minute series Illinois (Iroquois county), Gilman quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Gilman (Ill.); Iroquois County (Ill.) Relief shown by contours and spot heights.; "Mapped by the Geological Survey 1943-1944."; "Contour interval 10 feet."

10. The topographic maps of the United States [standard symbols]. The topographic maps of the United States [standard symbols]. Topographic maps; Topography; Symbols; Key; Topographical drawing; Conventional signs Map on verso.; Chart of standard map symbols used on U.S. topographic maps.

11. Illinois, Chicago sheet Illinois, Chicago sheet Illinois; Maps; Topographic maps; Topography; Chicago (Ill.) Relief indicated by contours.; "Surveyed in 1889."; "Contour interval 5 feet."

12. Illinois (Cook County), Evanston quadrangle : topographic sheet Illinois (Cook County), Evanston quadrangle : topographic sheet Illinois; Maps; Topographic maps; Topography; Evanston (Ill.) Relief indicated by contours.; "Surveyed in 1897."; "Contour interval 10 feet."

13. Illinois-Indiana, Calumet sheet Illinois-Indiana, Calumet sheet Illinois; Maps; Topographic maps; Topography; Calumet Region (Ill. and Ind.); Cook County (Ill.); Indiana Relief shown by contours.; "Contour interval 10 feet."; "Surveyed in 1889."

14. Illinois, Riverside quadrangle : topography Illinois, Riverside quadrangle : topography Cook County (Ill.); DuPage County (Ill.); Riverside (Ill.); Maps; Topographic maps; Topography; Illinois Relief shown by contours.; "Contour interval 10 feet."; "Surveyed in 1889-90, and [18]99."

15. Iowa-Illinois, Fort Madison quadrangle Iowa-Illinois, Fort Madison quadrangle Illinois; Maps; Topographic maps; Topography; Iowa; Fort Madison Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army."; "Contour interval 20 feet."; "Surveyed in 1928 and 1933."; Shows...

16. Illinois, Marseilles sheet. Illinois, Marseilles sheet. Marseilles (Ill.); Illinois; Maps; Topographic maps; Topography Relief indicated by contours.; "Surveyed in 1890."; "Contour interval 10 feet."

17. Illinois (Macoupin County) Gillespie quadrangle : topography Illinois (Macoupin County) Gillespie quadrangle : topography Illinois; Maps; Topographic maps; Topography; Gillespie (Ill.); Macoupin County (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1912."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

18. Illinois, Ottawa sheet. Illinois, Ottawa sheet. Ottawa (Ill.); Illinois; Maps; Topographic maps; Topography Relief indicated by contours.; "Surveyed in 1890."; "Contour interval 10 feet."

19. Iowa-Illinois Miles quadrangle Iowa-Illinois Miles quadrangle Miles; Iowa; Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1935."; "Contour interval 20 feet."; Shows roadway classification as of 1940.

20. Illinois, Delavan quadrangle : 15-minute series Illinois, Delavan quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Delavan (Ill.) Relief shown by contours and spot heights.; "Contour interval 10 feet"; "Surveyed in 1930 and 1935-1936."
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