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1. Illinois-Iowa, Edgington quadrangle : topography Illinois-Iowa, Edgington quadrangle : topography Illinois; Maps; Topographic maps; Topography; Edgington; Iowa Relief shown by contours and spot heights.; "Surveyed in 1913."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois."

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

3. Illinois-Iowa Galena quadrangle : topography Illinois-Iowa Galena quadrangle : topography Illinois; Maps; Topographic maps; Topography; Galena (Ill.); Iowa Relief indicated by contours and spot heights.; "Surveyed 1909 and 1911."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

4. Illinois, Galatia quadrangle : topography Illinois, Galatia quadrangle : topography Illinois; Maps; Topographic maps; Topography; Iowa; Galatia (Ill.) Relief indicated by contours and spot heights.; "Surveyed in 1906."; "Surveyed in cooperation with the State of Illinois.; "Contour interval 20 feet."

5. Iowa-Illinois, Muscatine quadrangle : 15-minute series. Iowa-Illinois, Muscatine quadrangle : 15-minute series. Muscatane (Ill.); Iowa; Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Mapped by the Geological Survey 1946"; "Contour interval 20 feet."; Shows roadway classification as of 1947.; Coordinates: (W 91⁰15ʹ00ʺ--W 91⁰00ʹ00ʺ/N...

6. 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.

7. Illinois-Iowa, Keithsburg quadrangle Illinois-Iowa, Keithsburg quadrangle Illinois; Maps; Topographic maps; Topography; Keithsburg; Iowa 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, 1931, 1934, and 1935"; "Contour intervals...

8. Illinois-Iowa, Lomax quadrangle Illinois-Iowa, Lomax quadrangle Illinois; Maps; Topographic maps; Topography; Lomax; Iowa 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 1931-1932"; "Contour interval 10 feet"; Shows roadway...

9. Iowa-Illinois, East Dubuque quadrangle Iowa-Illinois, East Dubuque quadrangle Illinois; Maps; Topographic maps; Topography; East Dubuque; Iowa Relief shown by contours and spot heights.; "Surveyed in 1935"; "Contour interval 20 feet."

10. 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."

11. 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...

12. Iowa-Illinois, Burlington quadrangle : topography Iowa-Illinois, Burlington quadrangle : topography Illinois; Maps; Topographic maps; Topography; Burlington; Iowa 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 1934."
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