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1. Species and Varieties, Their Origin by Mutation [electronic resource] / by Hugo DeVries
   author: DeVries, Hugo
   title: Species and Varieties, Their Origin by Mutation
   pagination: [none specified]
   publisher: Project Gutenberg, 2005
   notes: Project Gutenberg Freely available. Electronic text
   subjects:
   url: http://www.gutenberg.org/etext/7234