@article{196959,
      recid = {196959},
      author = {Ellefsen, Karl.},
      title = {Two-dimensional numerical simulation of elastic wave  propagation for environmental and geotechnical studies  [microform] /},
      publisher = {U.S. Dept. of the Interior, U.S. Geological Survey,},
      address = {[Denver, CO] :},
      pages = {35 p. :},
      year = {1993},
      note = {Cover title.},
      url = {http://library.usi.edu/record/196959},
}