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• Volkwein, J. C.; Covelli, A.; Thimons, E. D.
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  Dust Protection Afforded by Enclosed Cabs on Surface and Underground Mine Machinery.
  Bureau of Mines, Pittsburgh, PA
  Technical Progress Report 109, December 1979, 13 p.

• Cecala, A. B.; Covelli, A.
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  Pallet Loading Dust Control System.
  Bureau of Mines, Pittsburgh, PA
  RI 9197, 1988, 15 p.