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• Thimons, E. D.; Kohler, J. L.
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  Measurement of Air Velocity in Mines.
  Bureau of Mines, Pittsburgh, PA
  RI 8971, 1985, 29 p.

• Trutt, F. C.; Kohler, J. L.; Rotithor, H.; Novak, T.
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  Sensitive Ground-Fault Protection for Mines. Phase 3. Coordination-Free GFR's for AC Distribution. Mining Research Contract Report.
  Pennsylvania State Univ., University park
  Bureau of Mines, Washington, DC, OFR 2-89, June 22, 1988, 97 p.