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981. Illinois-Iowa, Edgington quadrangle : topography

Maps University Of Illinois Urbana Champaign Public content
1916. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1913.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma... Geological Survey (U.S.) and State Geological Survey (Urbana, Ill.).

982. Illinois-Iowa Galena quadrangle : topography

Maps University Of Illinois Urbana Champaign Public content
1913. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed 1909 and 1911.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot hei... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

983. Illinois-Iowa, Keithsburg quadrangle

Maps University Of Illinois Urbana Champaign Public content
1941. Geological Survey (U.S.). Contour intervals 10 and 20 feet changing on the 580 foot contour.;"Culture and drainage in part compiled from aerial photographs taken by Air Corp... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

984. Illinois-Iowa, Lomax quadrangle

Maps University Of Illinois Urbana Champaign Public content
1937. Geological Survey (U.S.). Contour interval 10 feet;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army";"Surveyed in 1931-1932";Reli... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

985. Illinois-Iowa, Oquawka quadrangle.

Maps University Of Illinois Urbana Champaign Public content
1940. Geological Survey (U.S.). Contour intervals 10 and 20 feet changing on the 580 foot contour.;"Culture and drainage in part compiled from aerial photographs taken by Air Corp... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

986. Illinois-Iowa-Missouri, Keokuk quadrangle

Maps University Of Illinois Urbana Champaign Public content
1936. Geological Survey (U.S.). Contour intervals 10 and 20 feet changing on the 500 foot contour;"Culture and drainage in part compiled from aerial photographs taken by Air Corps... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

987. Illinois-Kentucky, Brownfield quadrangle : topography

Maps University Of Illinois Urbana Champaign Public content
1917. Geological Survey (U.S.). Surveyed in 1914-1915.;"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 map, colored;45 x 36 cm.;... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

988. Illinois-Kentucky-Missouri, Cairo quadrangle

Maps University Of Illinois Urbana Champaign Public content
1933. Geological Survey (U.S.). Contour interval 5 and 20 feet.;"Culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army.";"Missouri part surve... Bureau of Mineral and Topographic Survey (Lexington, Ky.), Geological Survey (U.S.), and Geological Survey Division (Urbana, Ill.).

989. Illinois-Missouri, Alto Pass quadrangle

Maps University Of Illinois Urbana Champaign Public content
1924. Geological Survey (U.S.). Surveyed in 1921 and 1922.;Relief shown by contours and spot heights.;1 map, colored;45 x 36 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

990. Illinois-Missouri, Alton quadrangle

Maps University Of Illinois Urbana Champaign Public content
1934. Geological Survey (U.S.). Surveyed in 1922, 1924, 1925 and 1927.;Relief shown by contours and spot heights.;Road classification, 1932.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).