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  1. Rock River area assessment / Illinois Department of Natural Resources, Office of Scientific Research and Analysis, Natural History Survey Division, in conjunction with State Geological Survey Division.
    By: Illinois. - Illinois State Geological Survey. - Illinois.
    Publication info: Springfield, IL :Illinois Dept. of Natural Resources,1996-
    Contributed by: 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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