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211. Illinois, Okawville quadrangle : topography.

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1910. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1908.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;... Geological Survey (U.S.) and State Geological Survey (Urbana, Ill.).

212. Illinois, Oregon quadrangle.

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1924. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1921-1922"; (W 89⁰30ʹ00ʺ--W 89⁰15ʹ00ʺ/N 42⁰15ʹ00ʺ--N 42⁰00ʹ00ʺ);Relief shown by contours and spot heights.;1... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

213. Illinois, Orion quadrangle.

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1937. 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 1930-1932";Re... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

214. Illinois, Ottawa sheet.

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1892. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1890.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).

215. Illinois, Peoria quadrangle : topography.

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1905. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1902-1904.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).

216. Illinois, Petersburg quadrangle

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1938. Geological Survey (U.S.). Shows roadway classification as of 1937.;"Contour interval 10 feet";"Surveyed in 1922, 1928, and 1933";"Culture and drainage in part complied from ... Geological Survey (U.S.).

217. Illinois (Pike County), Pittsfield quadrangle.

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1926. Geological Survey (U.S.). 1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

218. Illinois, Pinckneyville quadrangle.

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1926. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1921 and 1924";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.).

219. Illinois, Piper City quadrangle : 15-minute series.

Maps University Of Illinois Urbana Champaign Public content
1947. Geological Survey (U.S.). Mapped by the Geological Survey, 1944;Contour interval 10 feet.";Relief shown by contours and spot heights.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

220. Illinois, Potomac quadrangle.

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1936. Geological Survey (U.S.). Contour interval 10 feet;"Surveyed in 1931-1932";(W 88⁰00ʹ00ʺ--W 87⁰45ʹ00ʺ/N 40⁰30ʹ00ʺ--N 40⁰15ʹ00ʺ);Relief shown by contours and spot heights.;Sho... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill).