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By: Illinois. Office of Realty and Environmental Planning. - Illinois. Natural History Survey Division - Critical Trends Assessment Program.Edition:Publication info: Springfield, Ill, Office of Realty and Environmental Planning, 2001Volume:Series:Holding Institution: University Library, University of Illinois Urbana ChampaignSubjects: Conservation of natural resources Ecological assessment (Biology) Effects of human beings on Environmental impact analysis Environmental quality Illinois Nature PollutionBHL Collections: