Place: Illinois / Creator: Geological Survey (U.S.) / Publisher: Geological Survey Division (Urbana, Ill) - GeoBlacklight Search Results

Start Over Place Illinois Creator Geological Survey (U.S.) Publisher Geological Survey Division (Urbana, Ill)

1. Illinois, Potomac quadrangle.

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).

2. Indiana-Illinois, Vincennes quadrangle : topography

1915. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1911-1913.";"Surveyed in cooperation with the State of Illinois."; (W 87⁰45ʹ00ʺ--W 87⁰30ʹ00ʺ/N 38⁰45ʹ00ʺ--N ... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill).

3. Missouri-Illinois, Hannibal quadrangle

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 1921 and 1928... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill).