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1. Illinois-Iowa, Milan quadrangle : topography. Illinois-Iowa, Milan quadrangle : topography. Milan (Ill.); Iowa; Illinois; Maps; Topographic maps; Topography Relief shown by contours and spot heights.; "Surveyed in 1910."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

2. Illinois-Iowa, Lomax quadrangle Illinois-Iowa, Lomax quadrangle Illinois; Maps; Topographic maps; Topography; Lomax; 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 1931-1932"; "Contour interval 10 feet"; Shows roadway...

3. 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...

4. Illinois-Iowa Galena quadrangle : topography Illinois-Iowa Galena quadrangle : topography Illinois; Maps; Topographic maps; Topography; Galena (Ill.); Iowa Relief indicated by contours and spot heights.; "Surveyed 1909 and 1911."; "Surveyed in cooperation with the State of Illinois."; "Contour interval 20 feet."

5. Illinois-Iowa, Edgington quadrangle : topography Illinois-Iowa, Edgington quadrangle : topography Illinois; Maps; Topographic maps; Topography; Edgington; Iowa Relief shown by contours and spot heights.; "Surveyed in 1913."; "Contour interval 20 feet."; "Surveyed in cooperation with the State of Illinois."

6. 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...
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