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  1. 1
    by Darwin, Charles, 1809-1882
    Published 1882
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    The various contrivances by which orchids are fertilised by insects /
  2. 2
    by Darwin, Charles, 1809-1882
    Published 1862
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    On the various contrivances by which British and foreign orchids are fertilised by insects : and on the good effects of intercrossing /

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