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• Freedman, R. W.; Duerr, W. H.; Litton, C. D.
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  Construction and Preliminary Evaluation of a Diesel Exhaust Particulate Filter for Underground Use. Technical Progress Report.
  Bureau of Mines, Pittsburgh, PA
  TPR 106
  TPR 106
  March 1979
  12 p.

• Freedman, R. W.; Ferber, B. I.; Duerr, W. H.
  view article (1.0)

  Gas-Sampling Capability of Vacutainers.
  Bureau of Mines, Pittsburgh, PA
  RI 8281
  RI 8281
  1978
  8 p.