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• Water in a Continuous Spray Is Used Along the Face of the Long Wall When the Coal Machine Is in Operation to Cut Down on the Amount of Airborne Dust 04/1974

  • Uploaded by: U.S. National Archives
  • License: No known copyright restrictions
  • 1 comment
  • 3 favorites
  • 12,818 views
  • Date taken: 1974
  • Date uploaded: 2009-09-10
  • Tags: usnationalarchives, environmentalprotectionagency, documerica, nara:arcid=556361
  • Visibility: public