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831. Illinois, Colchester quadrangle : topography

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1913. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1911."; (W 91⁰00ʹ00ʺ--W 90⁰45ʹ00ʺ/N 40⁰30ʹ00ʺ--N 40⁰15ʹ00ʺ);Relief shown by contours.;1 map, colored;45 x 35... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

832. Illinois (Cook County), Chicago quadrangle : topographic sheet

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1901. Geological Survey (U.S.). Contour interval 5 feet.;"Surveyed in 1889, 1897 and 1899.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.).

834. Illinois, Coulterville quadrangle : topography

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1917. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1914.";"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.).

835. Illinois, Danvers quadrangle

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1930. Geological Survey (U.S.). Contour interval 10 feet;"Surveyed in 1926-1927.";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.).

836. Illinois, De Kalb quadrangle

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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 1934";Relief s... Geological Survey (U.S.).

837. Illinois, Decatur quadrangle

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1933. Geological Survey (U.S.). Contour interval 10 feet;"Surveyed in 1929"; (W 89⁰00ʹ00ʺ--W 88⁰45ʹ00ʺ/N 40⁰00ʹ00ʺ--N 39⁰45ʹ00ʺ);Relief shown by contours and spot heights.;Shows r... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).

838. Illinois, Delavan quadrangle : 15-minute series

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1942. Geological Survey (U.S.). Contour interval 10 feet;"Surveyed in 1930 and 1935-1936.";Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey Division (Urbana, Ill.), 1942. and U.S. Geological Survey (Washington, D.C.).

839. Illinois, Des Plaines sheet

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1890. Geological Survey (U.S.). Contour interval 10 feet.;"Surveyed in 1889-90.";Relief indicated by contours.;1 map, colored;45 x 34 cm.;1:62,500. U.S. Geological Survey (U.S.).

840. Illinois, Divernon quadrangle

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1957. Geological Survey (U.S.). Contour interval 10 feet;"Surveyed in 1922.";Relief shown by contours and spot heights.;1 map, colored;45 x 35 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division, (Urbana, Ill.).