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181. Iowa-Illinois, Muscatine quadrangle : 15-minute series.

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1948. Geological Survey (U.S.). Contour interval 20 feet.;"Mapped by the Geological Survey 1946"; (W 91⁰15ʹ00ʺ--W 91⁰00ʹ00ʺ/N 41⁰30ʹ00ʺ--N 41⁰15ʹ00ʺ);Relief shown by contours and... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

182. Kansas quadrangle, Illinois : 15 minute series (topographic)

Maps University Of Illinois Urbana Champaign Public content
1949. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1939. Topography by plane-table methods 1946.";Relie... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

183. Kenney 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 1957. Aerial photographs taken 1956.";Reli... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

184. Kentucky-Illinois Golconda quadrangle : topography

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1921. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1914, 1916 and 1920.";"Surveyed in cooperation with the States of Kentucky and Illinois."; (W 88⁰30ʹ00ʺ--W 8... Geological Survey (U.S.), Geological Survey Division (Urbana, Ill.), and Kentucky Geological Survey (Lexington, Ky.).

185. 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.).

186. 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.).

187. 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.).

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

Maps University Of Illinois Urbana Champaign Public content
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.).

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

Maps University Of Illinois Urbana Champaign Public content
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.).

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

Maps University Of Illinois Urbana Champaign Public content
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.).