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  1. Observing, photographing, and collecting plants /
    By: Robertson, Kenneth Ray, - Illinois. Natural History Survey Division.
    Publication info: Urbana, [Ill] :Illinois Natural History Survey,1980.
    Holding Institution: University Library, University of Illinois Urbana Champaign
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  2. The preservation and management of vegetation in ravines in Highland Park, Illinois : a report /
    By: Robertson, Kenneth Ray, - Himelick, E. B. (Eugene Bryson), - Highland Park, Ill. Community Development Dept. - Highland Park, Ill. Public Works Dept. - Illinois. Natural History Survey Division.
    Publication info: Urbana :The Survey,1977.
    Holding Institution: University Library, University of Illinois Urbana Champaign
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