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  1. Illinois River Bluffs area assessment / Illinois Department of Natural Resources, Office of Scientific Research and Analysis, [and the] State Geological Survey Division.
    By: Illinois. - Critical Trends Assessment Project. - Illinois State Geological Survey. - Illinois.
    Publication info: Springfield, Ill. :Illinois Dept. of Natural Resources,1998-
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Illinois  Illinois River Watershed  Illinois River Watershed (Ill.)  Natural resources conservation areas  Natural resources surveys  
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