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  1. Observing, photographing, and collecting plants / Kenneth R. Robertson.
    By: Robertson, Kenneth Ray, - Illinois.
    Publication info: Urbana, [Ill] :Illinois Natural History Survey,1980.
    Contributed by: University of Illinois Urbana Champaign
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  2. The preservation and management of vegetation in ravines in Highland Park, Illinois : a report / prepared by Kenneth R. Robertson and E. B. Himelick of the Illinois Natural History Survey, Urbana, Illinois.
    By: Robertson, Kenneth Ray, - Himelick, E. B. - Highland Park, Ill. - Illinois.
    Publication info: Urbana :The Survey,1977.
    Contributed by: University of Illinois Urbana Champaign
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