@article{195534,
      note = {Distributed to depository libraries in microfiche.},
      author = {Chekan, G. J. and Listak, Jeffrey M.},
      url = {http://library.usi.edu/record/195534},
      title = {Design practices for multiple-seam longwall mines  [microform] /},
      publisher = {U.S. Dept. of the Interior, Bureau of Mines,},
      recid = {195534},
      pages = {ii, 35 p. :},
      address = {Washington, D.C. :},
      year = {1993},
}