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 Image: Title: Subject: Description:
1. Iowa-Illinois, Muscatine quadrangle : 15-minute series. Iowa-Illinois, Muscatine quadrangle : 15-minute series. Muscatane (Ill.); Iowa; Illinois; Maps; Topographic maps; Topography 1 map : col.; 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...
2. Iowa-Illinois, Savanna sheet : reconnaissance map Iowa-Illinois, Savanna sheet : reconnaissance map Savanna (Ill.); Iowa; Maps; Topographic maps; Topography; Illinois 1 map : col.; Relief shown by contours.; "Surveyed in 1890."; "Contour interval 20 feet."
3. Illinois-Iowa, Milan quadrangle : topography. Illinois-Iowa, Milan quadrangle : topography. Milan (Ill.); Iowa; Illinois; Maps; Topographic maps; Topography 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1910."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."
4. Illinois-Iowa, Lomax quadrangle Illinois-Iowa, Lomax quadrangle Illinois; Maps; Topographic maps; Topography; Lomax; Iowa 1 map : col.; 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";...
5. Iowa-Illinois, East Dubuque quadrangle Iowa-Illinois, East Dubuque quadrangle Illinois; Maps; Topographic maps; Topography; East Dubuque; Iowa 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1935"; "Contour interval 20 feet."
6. Illinois-Iowa Galena quadrangle : topography Illinois-Iowa Galena quadrangle : topography Illinois; Maps; Topographic maps; Topography; Galena (Ill.); Iowa 1 map : col.; Relief indicated by contours and spot heights.; "Surveyed 1909 and 1911."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."
7. Iowa-Illinois, Fort Madison quadrangle Iowa-Illinois, Fort Madison quadrangle Illinois; Maps; Topographic maps; Topography; Iowa; Fort Madison 1 map : col.; 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...
8. Illinois, Galatia quadrangle : topography Illinois, Galatia quadrangle : topography Illinois; Maps; Topographic maps; Topography; Iowa; Galatia (Ill.) 1 map : col.; Relief indicated by contours and spot heights.; "Surveyed in 1906."; "Surveyed in cooperation with the State of Illinois.; "Contour interval 20 feet."
9. Illinois-Iowa, Edgington quadrangle : topography Illinois-Iowa, Edgington quadrangle : topography Illinois; Maps; Topographic maps; Topography; Edgington; Iowa 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1913."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois."
10. Iowa-Illinois, Burlington quadrangle : topography Iowa-Illinois, Burlington quadrangle : topography Illinois; Maps; Topographic maps; Topography; Burlington; Iowa 1 map : col.; 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. Illinois-Iowa, Keithsburg quadrangle Illinois-Iowa, Keithsburg quadrangle Illinois; Maps; Topographic maps; Topography; Keithsburg; Iowa 1 map : col.; 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...
12. Iowa-Illinois Miles quadrangle Iowa-Illinois Miles quadrangle Miles; Iowa; Illinois; Maps; Topographic maps; Topography 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1935."; "Contour interval 20 feet."; Shows roadway classification as of 1940.
13. Iowa-Illinois, LeClaire sheet : reconnaissance map Iowa-Illinois, LeClaire sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; Le Claire (Ia); Iowa 1 map : col.; Relief shown by contours.; "Surveyed in 1890."; "Contour interval 20 feet"
14. Iowa-Illinois, Clinton sheet : reconnaissance map Iowa-Illinois, Clinton sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; Clinton (Ill.); Iowa 1 map : col.; Relief shown by contours.; "Surveyed in 1890."; "Contour interval 20 feet."
15. Iowa-Illinois, Goose Lake sheet : reconnaissance map Iowa-Illinois, Goose Lake sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; Goose Lake; Iowa 1 map : col.; Relief shown by contours.; "Surveyed in 1890."; "Contour interval 20 feet."
16. Iowa-Illinois, Davenport sheet : reconnaissance map Iowa-Illinois, Davenport sheet : reconnaissance map Illinois; Maps; Topographic maps; Topography; Iowa; Davenport 1 map : col.; Relief shown by contours and spot heights.; "Surveyed in 1889."; "Contour interval 20 feet."
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