@article{76740,
      author = {Edmonds, Walter D. and Morrill, Leslie H.,},
      url = {http://library.usi.edu/record/76740},
      title = {Beaver valley /},
      publisher = {Little, Brown,},
      abstract = {The dam built by a colony of beavers changes the  environment of a valley and threatens the lives of many  animal residents.},
      recid = {76740},
      pages = {70 p. :},
      address = {Boston :},
      year = {1971},
}