@article{125849,
      note = {"Written under the auspices of the Center for Philosophy  and Public Policy, University of Maryland"--Opp. t.p.},
      author = {Norton, Bryan G.},
      url = {http://library.usi.edu/record/125849},
      title = {Why preserve natural variety? /},
      publisher = {Princeton University Press,},
      recid = {125849},
      pages = {xiii, 281 p. ;},
      address = {Princeton, N.J. :},
      year = {1987},
}