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  1. Critical trends in Illinois ecosystems /
    By: Critical Trends Assessment Program. - Illinois. Natural History Survey Division - Illinois. Office of Realty and Environmental Planning
    Publication info: Springfield, Ill. :Illinois Natural History Survey,2001.
    Holding Institution: University Library, 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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