@article{52649,
      author = {Bauer, Robert A.,},
      url = {http://library.usi.edu/record/52649},
      title = {Geologic investigation of roof and floor strata : Longwall  demonstration, Old Ben Mine no. 24 : final technical  report, no. 1 /},
      publisher = {Illinois State Geological Survey,},
      recid = {52649},
      pages = {49 p. :},
      address = {Champaign, Ill. :},
      year = {1982},
}