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  1. Critical trends in Illinois ecosystems / Illinois Department of Natural Resources, Office of Realty and Environmental Planning ; in collaboration with Office of Scientific Research and Analysis ; Natural History Survey Division ; Brent Manni
    By: Critical Trends Assessment Program. - Illinois. - Illinois.
    Publication info: Springfield, Ill. :Illinois Natural History Survey,2001.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Conservation of natural resources  Ecological assessment (Biology)  Effects of human beings on  Environmental impact analysis  Environmental quality  Illinois  Nature  Pollution  
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