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  1. Flowers and insects; lists of visitors of four hundred and fifty-three flowers, by Charles Robertson.
    By: Robertson, Charles,
    Publication info: Carlinville, Ill.,n.p.1928.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Bees  Fertilization of plants  Flowers  Illinois  Insects  Macoupin County  
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