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By: Illinois. Dept. of Natural Resources. - Illinois. Natural History Survey Division - Illinois State Geological Survey.Edition:Publication info: Springfield, IL, Illinois Dept. of Natural Resources, 1996-Volume: 1Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects: Illinois Natural areas Natural resources Natural resources surveys Rock River Rock River Region (Wis. and Ill.) Rock River Watershed (Wis. and Ill.)BHL Collections: