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1. Illinois (Jo Daviess County), Elizabeth quadrangle : topography

Maps University Of Illinois Urbana Champaign Public content
1911. Geological Survey (U.S.). Contour interval 20 feet.;"Surveyed in 1909.";"Surveyed in cooperation with the State of Illinois.";Relief indicated by contours and spot heights.;... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).