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1. 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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