@article{54473,
      recid = {54473},
      author = {Bretsky, Peter William,},
      title = {Upper Ordovician ecology of the central Appalachians.},
      publisher = {Peabody Museum of Natural History, Yale University,},
      address = {New Haven,},
      pages = {viii, 150 p.},
      year = {1970},
      note = {Summaries in German and Russian.},
      url = {http://library.usi.edu/record/54473},
}