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Start Over Year 1912 Place Iowa Bounding Box -86.51116 39.149274 -86.508949 39.150938

1. Illinois-Iowa, Milan quadrangle : topography.

University Of Illinois Urbana Champaign Public content
1912. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1910.";"Surveyed in cooperation with the State of Illinois.";Relief shown by contours and spot heights.;1 ma... Geological Survey (U.S.)|Geological Survey Division (Urbana, Ill.).