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  1. Rock River area assessment /
    By: Illinois. Dept. of Natural Resources. - Illinois State Geological Survey. - Illinois. Natural History Survey Division.
    Publication info: Springfield, IL :Illinois Dept. of Natural Resources,1996-
    Holding Institution: University Library, University of Illinois Urbana Champaign
    Subjects: Illinois  Natural areas  Natural resources  Natural resources surveys  Rock River  Rock River Region (Wis. and Ill.)  Rock River Watershed (Wis. and Ill.)  
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