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1. Illinois-Iowa, Oquawka quadrangle. Illinois-Iowa, Oquawka quadrangle. Oquawka (Ill.); Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1931 and 1934"; "Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army."; "Contour intervals 10 and 20 feet...

2. Illinois, Camp Point quadrangle : 15-minute series Illinois, Camp Point quadrangle : 15-minute series Illinois; Maps; Topographic maps; Topography; Camp Point (Ill.) Relief shown by contours and spot heights.; "Mapped by the Geological Survey 1946."; "Contour interval 20 feet ; 10 foot contours added in dashed lines."

3. 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...

4. Illinois-Iowa-Missouri, Keokuk quadrangle Illinois-Iowa-Missouri, Keokuk quadrangle Illinois; Maps; Topographic maps; Topography; Keokuk; Missouri 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, 1928 and 1932"; "Contour intervals 10 and 20...
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