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

2. 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"

3. 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."

4. 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."

5. 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."

6. Iowa-Illinois, Davenport sheet : reconnaissance map Iowa-Illinois, Davenport sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; Iowa; Davenport Relief shown by contours and spot heights.; "Surveyed in 1889."; "Contour interval 20 feet."

7. 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...

8. 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.

9. 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...

10. 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."

11. Wapello quadrangle, Iowa-Illinois : 15 minute series (topographic) Wapello quadrangle, Iowa-Illinois : 15 minute series (topographic) Maps; Topographic maps; Topography; Illinois; Wapello (Ill.) Relief shown by contours and spot heights.; "Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods, 1946."; "Contour interval 10 feet."
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