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231. Kentucky-Illinois, La Center quadrangle

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1932. 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 1926 and 1928"... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Kentucky Geological Survey (Lexington, Ky.).

232. Kentucky-Illinois Paducah quadrangle.

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1929. 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 1926";Relief s... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Kentucky Geological Survey (Lexington, Ky.).

233. Kentucky-Illinois Smithland quadrangle

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1929. Geological Survey (U.S.). Contour interval 20 feet.;"Illinos culture and drainage in part compiled from aerial photographs taken by Air Corps, U.S. Army";"Surveyed in 1926";... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Kentucky Geological Survey (Lexington, Ky.).

234. Le Roy quadrangle, Illinois : 15 minute series (topographic)

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1952. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1940. Topography by plane-table surveys 1930 and 195... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

235. llinois, Greenup quadrangle : 15-minute series.

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1943. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1929 and 1939-1940"; (W 88⁰15ʹ00ʺ--W 88⁰00ʹ00ʺ/N 39⁰15ʹ00ʺ--N 39⁰00ʹ00ʺ);Relief shown by contours and spot h... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

236. Maroa quadrangle, Illinois : 15 minute series (topographic).

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1958. Geological Survey (U.S.). Contour interval 10 feet.;"Topography from aerial photographs by Kelsh plotter and by planetable surveys 1956-1957. Aerial photographs taken 1956."... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

237. Mason City quadrangle, Illinois : 15 minute series (topographic)

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1963. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1939-1940. Topography by plane-table methods 1947-19... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

238. McLean quadrangle, Illinois : 15 minute series (topographic)

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1951. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1940-1941. Topography by plane-table methods, 1926, ... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

239. Mechanicsburg quadrangle, Illinois : 15 minute series (topographic).

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1955. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1950-1951. Topography by plane-table surveys 1954";R... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

240. Mendon quadrangle, Illinois-Missouri : 15 minute series (topographic).

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1956. Geological Survey (U.S.). Contour interval 20 feet.;"Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods, 1946.";Reli... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Geological Survey and Water Resources (Rolla, Mo.).