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1. Iowa-Illinois, Savanna sheet : reconnaissance map Iowa-Illinois, Savanna sheet : reconnaissance map Savanna (Ill.); Iowa; Maps; Topographic maps; Topography; Illinois Relief shown by contours.; "Surveyed in 1890."; "Contour interval 20 feet."

2. Illinois, Carlyle quadrangle : topography Illinois, Carlyle quadrangle : topography Illinois; Maps; Topographic maps; Topography; Carlyle Region (Ill.) Relief indicated by contours and spot heights.; Surveyed in 1908.; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

3. Illinois-Indiana, Watseka quadrangle Illinois-Indiana, Watseka quadrangle Maps; Topographic maps; Topography; Illinois; Watseka; Indiana Relief shown by contours and spot heights.; "Surveyed in 1934-1935."; Shows roadway classification as of 1938.; "Contour interval 10 feet."

4. Mendota quadrangle, Illinois : 15 minute series (topographic). Mendota quadrangle, Illinois : 15 minute series (topographic). Mendota (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1939, 1941 and 1951. Topography by plane-table surveys 1952"; "Contour interval 10 feet.";...

5. Illinois, LaSalle sheet : reconnaissance map Illinois, LaSalle sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; La Salle (Ill.) Relief indicated by contours.; "Surveyed in 1891."; "Contour interval 10 feet"

6. Illinois, Peoria quadrangle : topography. Illinois, Peoria quadrangle : topography. Peoria (Ill.); Illinois; Maps; Topographic maps; Topography Relief indicated by contours.; "Surveyed in 1902-1904."; "Contour interval 10 feet."

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

8. 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."

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

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

11. Iowa-Illinois, LeClaire sheet : reconnaissance map Iowa-Illinois, LeClaire sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; Le Claire (Ia); Iowa Relief shown by contours.; "Surveyed in 1890."; "Contour interval 20 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. Iowa-Illinois, Clinton sheet : reconnaissance map Iowa-Illinois, Clinton sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; Clinton (Ill.); Iowa Relief shown by contours.; "Surveyed in 1890."; "Contour interval 20 feet."

14. 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."

15. Illinois-Indiana, Danville quadrangle : topographic sheet Illinois-Indiana, Danville quadrangle : topographic sheet Illinois; Maps; Topographic maps; Topography; Indiana; Danville (Ill.) Relief indicated by contours and spot heights.; "Surveyed in 1897.; "Contour interval 10 feet."

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

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

18. Illinois (Cook County), Chicago quadrangle : topographic sheet Illinois (Cook County), Chicago quadrangle : topographic sheet Illinois; Maps; Topographic maps; Topography; Chicago (Ill.); Cook County (Ill.) Relief indicated by contours.; "Surveyed in 1889, 1897 and 1899."; "Contour interval 5 feet."

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

20. Saint Louis quadrangle, Missouri-Illinois Saint Louis quadrangle, Missouri-Illinois Maps; Topographic maps; Topography; Illinois; Missouri; Saint Louis (Mo.); St. Louis (Mo.); Saint Louis County (Mo.); Saint Clair County (Ill.); Madison County (Ill.) Relief shown by contours, spot heights and bathymetric soundings.; "Surveyed in 1903."; "Contour interval 20 feet."
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