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1. Illinois, Carbondale quadrangle : topography Illinois, Carbondale quadrangle : topography Illinois; Maps; Topographic maps; Topography; Carbondale (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1919 and 1921."; "Surveyed in cooperation with the State of Illinois."; "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, Vermont quadrangle : topography Illinois, Vermont quadrangle : topography Maps; Topographic maps; Topography; Illinois; Vermont (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1916 and 1919."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

4. Illinois (Champaign County), Urbana quadrangle : topography Illinois (Champaign County), Urbana quadrangle : topography Maps; Topographic maps; Topography; Illinois; Urbana (Ill.); Champaign County (Ill.) Relief indicated by contours and spot heights.; "Surveyed in 1905."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 10 feet."; Includes "diagram of township."

5. Illinois, Waterloo quadrangle : topography Illinois, Waterloo quadrangle : topography Maps; Topographic maps; Topography; Illinois; Waterloo (Ill.) Relief indicated by contours and spot heights.; "Surveyed in 1910."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

6. Illinois, Marseilles quadrangle : topography. Illinois, Marseilles quadrangle : topography. Marseilles (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1913."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois."

7. Illinois, Wheaton quadrangle : topography Illinois, Wheaton quadrangle : topography Maps; Topographic maps; Topography; Illinois; Wheaton (Ill.) Relief indicated by contours and spot heights.; "Surveyed in 1906."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 10 feet."

8. Illinois, Cave in Rock quadrangle Illinois, Cave in Rock quadrangle Illinois; Maps; Topographic maps; Topography; Cave in Rock (Ill.) Relief shown by contours.; "Surveyed in 1914."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois."

9. Illinois, Elgin quadrangle Illinois, Elgin quadrangle Illinois; Maps; Topographic maps; Topography; Elgin (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1923"; "Contour interval 10 feet."

10. Illinois, Dongola quadrangle Illinois, Dongola quadrangle Illinois; Maps; Topographic maps; Topography; Dongola (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1919-1920, in cooperation with the State of Illinois."; "Contour interval 20 feet."

11. Illinois, Ramsey quadrangle : 15-minute series. Illinois, Ramsey quadrangle : 15-minute series. Ramsey (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Mapped by the Geological Survey, 1922 and 1942-1944"; "Contour interval 20 feet."

12. Illinois, Herrin quadrangle : topography Illinois, Herrin quadrangle : topography Illinois; Maps; Topographic maps; Topography; Herrin (Ill.) Relief indicated by contours and spot heights.; "Surveyed in 1908."; "Surveyed in cooperation with the State of Illinois."

13. Illinois, Joliet quadrangle : topography Illinois, Joliet quadrangle : topography Illinois; Maps; Topographic maps; Topography; Joliet (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1920."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 10 feet."

14. Illinois, Breese quadrangle Illinois, Breese quadrangle Illinois; Maps; Topographic maps; Topography; Breese (Ill.) Relief indicated by contours and spot heights.; "Surveyed in 1906."; "Surveyed in cooperation with the State of Illinois."

15. Illinois, Morris quadrangle : topography Illinois, Morris quadrangle : topography Morris (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1915."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

16. Illinois, Good Hope quadrangle : topography Illinois, Good Hope quadrangle : topography Illinois; Maps; Topographic maps; Topography; Good Hope (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1916."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

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

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

19. Illinois, Mahomet quadrangle : topography Illinois, Mahomet quadrangle : topography Mahomet (Ill.); Illinois; Maps; Topographic maps; Topography; Champaign County (Ill.) Relief shown by contours.; "Surveyed in 1905."; "Surveyed in cooperation with the State of Illinois."; Includes diagram of township.

20. Illinois, Streator quadrangle Illinois, Streator quadrangle Maps; Topographic maps; Topography; Illinois; Streator (Ill.) Relief shown by contours and spot heights.; "Surveyed in 1924 and 1925"; "Contour interval 10 feet"; Includes text on verso.
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