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• Berry, D. R.; Billar, J. E.; Boghani, A. B.; Burnett, M.; Hoadley, D.; Maser, K. R.; Trent, R. H.
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  Development of Emergency Escape Systems Guidelines for Underground Metal and Nonmetal Mines. Final Report.
  Foster-Miller Associates, Inc., Waltham, MA
  OFR 134-77
  Bureau of Mines, Washington, DC, OFR 134-77
  May 1976
  336 p.