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  • Variation of colour in rats as described in Mendel's Law, plate 6 in Genetics and Eugenics by W. E. Castle, Harvard University Press, 1916
  • Colour variation in wild Norway rats captured in England, fig 57 opp. page 126 in Genetics and Eugenics by W. E. Castle, Harvard University Press, 1916
  • De generis humani varietate nativa / Auctore, Io. Frid. Blumenbach.
  • The variation of animals and plants under domestication / by Charles Darwin.
  • The variation of animals and plants under domestication / by Charles Darwin.
  • The variation of animals and plants under domestication / by Charles Darwin.
  • The variation of animals and plants under domestication / by Charles Darwin.
  • Die Mutationstheorie : Versuche und Beobachtungen über die Entstehung von Arten im Pflanzenreich / von Hugo de Vries.