@article{229696,
      recid = {229696},
      author = {Ewert, John W. and Swanson, Donald A.},
      title = {Monitoring volcanoes : techniques and strategies used by  the staff of the Cascades Volcano Observatory, 1980-90 /},
      publisher = {U.S. G.P.O. ;},
      address = {Washington :},
      pages = {iv, 223 p. :},
      year = {1992},
      url = {http://library.usi.edu/record/229696},
}