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  1. On the variation of species.
    By: Wollaston, Thomas Vernon.
    Publication info: London :John Van Voorst,1856.
    Contributed by: Cambridge University Library
    BHL Collections: Charles Darwin's Library
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  2. On the variation of species. : [Supplementary material in Charles Darwin's copy].
    By: Darwin, Charles, - Wollaston, Thomas Vernon.
    Contributed by: Cambridge University Library
    BHL Collections: Charles Darwin's Library
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