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271. 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.).

272. Illinois-Iowa-Missouri, Keokuk quadrangle

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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.).

273. Illinois-Kentucky, Brownfield quadrangle : topography

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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.).

274. Illinois-Kentucky-Missouri, Cairo quadrangle

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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.).

275. Illinois-Missouri, Alto Pass quadrangle

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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.).

276. Illinois-Missouri, Alton quadrangle

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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.).

277. Illinois-Missouri, Barry quadrangle

Maps University Of Illinois Urbana Champaign Public content
1931. Geological Survey (U.S.). Surveyed in 1921-1922 and 1928.;Relief shown by contours and spot heights.;Road classification, 1931.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

278. Illinois-Missouri, Campbell Hill quadrangle : topography

Maps University Of Illinois Urbana Champaign Public content
1918. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1915-1916.";"Surveyed in cooperation with the States of Illinois and Missouri."; (W 89⁰45ʹ00ʺ--W 89⁰30ʹ00ʺ/N... Geological Survey Division (Urbana, Ill.), State of Missouri Bureau of Geology and Mines (Rolla, Mo.), and Geological Survey (U.S.).

279. Illinois-Missouri, Chester quadrangle : topography

Maps University Of Illinois Urbana Champaign Public content
1915. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1912-1913.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours.;1 map, colored;4... Geological Survey (U.S.) and State Geological Survey (Urbana, Ill.).

280. Illinois-Missouri Hardin quadrangle

Maps University Of Illinois Urbana Champaign Public content
1930. 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 1927.";Relief... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).