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1999. 2002-06-01T04:00:00Z. 2016-07-23T21:13:22Z. Geological Survey (U.S.). The Survey ; Information Services [distributor]. English. cartographic image. Public. Illinois and Illinois.
1999. 2011-11-16T21:12:38Z. 2015-10-21T15:05:57Z. United States Coast Survey. The Survey ; NOAA Distribution Division, N/ACC3, National Ocean Service, distributor. English. Public. Illinois, Chicago, Indiana Harbor (East Chicago, Ind.), and Michigan, Lake.