@article{32530,
      author = {Unger, E. E.},
      url = {http://library.usi.edu/record/32530},
      title = {The noise of mobile machines used in surface coal mines :  operator exposure, source diagnosis, potential noise  control treatments /},
      publisher = {Office of the Assistant Director--Mining, Bureau of Mines,  U.S. Dept. of the Interior,},
      recid = {32530},
      pages = {114 p. :},
      address = {Washington :},
      year = {1979},
}