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• Webb, W. E.; Church, R. H.; Pittman, W. E., Jr.; Boyle, J. R., Jr.
  view article (10.004545)

  Short-Range Locator System for Detecting Trapped Miners.
  Bureau of Mines, Pittsburgh, PA
  RI 8844, 1984, 25 p.

• Pittman, W. E., Jr.; Church, R. H.; Webb, W. E.; McLendon, J. T.
  view article (9.992496)

  Ground Penetrating Radar--A Review of Its Application in the Mining Industry.
  Bureau of Mines, Pittsburgh, PA
  IC 8964, 1984, 26 p.