@article{478767,
      recid = {478767},
      author = {Darwin, Charles, and Peckham, Morse.},
      title = {The origin of species a variorum text / [electronic  resource] :},
      publisher = {University of Pennsylvania Press,},
      address = {Philadelphia [Pa.] :},
      pages = {816 p. :},
      year = {1959},
      note = {With a reproduction of the t.p. of the original ed.  published in 1859 under title: On the origin of species by  means of natural selection.},
      url = {http://library.usi.edu/record/478767},
}