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11. Iowa-Illinois, Fort Madison quadrangle

Maps University Of Illinois Urbana Champaign Public content
1936. Geological Survey (U.S.). Contour interval 20 feet.;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.";"Surveyed in 1928 and 1933... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

12. Iowa-Illinois, Goose Lake sheet : reconnaissance map

Maps University Of Illinois Urbana Champaign Public content
1894. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1890.";Relief shown by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).

13. Iowa-Illinois, LeClaire sheet : reconnaissance map

Maps University Of Illinois Urbana Champaign Public content
1905. Geological Survey (U.S.). Contour interval 20 feet;"Surveyed in 1890.";Relief shown by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).

14. Iowa-Illinois Miles quadrangle

Maps University Of Illinois Urbana Champaign Public content
1941. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1935.";Relief shown by contours and spot heights.;Shows roadway classification as of 1940.;1 map, colored;45... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

15. Iowa-Illinois, Muscatine quadrangle : 15-minute series.

Maps University Of Illinois Urbana Champaign Public content
1948. Geological Survey (U.S.). Contour interval 20 feet.;"Mapped by the Geological Survey 1946"; (W 91⁰15ʹ00ʺ--W 91⁰00ʹ00ʺ/N 41⁰30ʹ00ʺ--N 41⁰15ʹ00ʺ);Relief shown by contours and... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

16. Iowa-Illinois, Savanna sheet : reconnaissance map

Maps University Of Illinois Urbana Champaign Public content
1916. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1890.";Relief shown by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).