@article{319985,
      author = {Pursell, Carroll W.,},
      url = {http://library.usi.edu/record/319985},
      title = {From conservation to ecology: the development of  environmental concern,},
      publisher = {Crowell},
      recid = {319985},
      pages = {148 p.},
      address = {New York,},
      year = {1973},
}