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  1. The humble-bee : its life-history and how to domesticate it, with descriptions of all the British species of Bombus and Psithyrus.
    By: Sladen, F. W. L.
    Publication info: London :Macmillan,1912.
    Contributed by: Earth Sciences - University of Toronto (archive.org)
    Subjects: Bees  Bombus  Cuckoo bumblebees  
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  2. The humble-bee, its life-history and how to domesticate it, with descriptions of all the British species of Bombus and Psithyrus, by F. W. L. Sladen ...
    By: Sladen, Frederick William Lambert.
    Publication info: London,Macmillan and co., limited,1912.
    Contributed by: University of Illinois Urbana Champaign
    Subjects: Bombus  Psithyrus  
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