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Start Over Place Illinois--La Salle County Publisher State Geological Survey (Urbana, Ill.) Bounding Box -40.000931 39.999015 -39.999064 40.000987

1. Illinois (La Salle County), Ottawa quadrangle : topography.

Maps University Of Illinois Urbana Champaign Public content
1915. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1912.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma... Geological Survey (U.S.) and State Geological Survey (Urbana, Ill.).

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