@article{25135,
      author = {Olson, Storrs L.},
      url = {http://library.usi.edu/record/25135},
      title = {Presbyornis and the origin of the Anseriformes (Aves,  Charadriomorphae) /},
      publisher = {Smithsonian Institution Press,},
      recid = {25135},
      pages = {iii, 24 p. :},
      address = {Washington :},
      year = {1980},
}