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• Heyn, W.
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  Underground Measurement of Smoke Density at the Tremonia Experimental Mine in Order to Determine Visibility in Fire Gases.
  Tremonia Experimental Mine, Dortmund, German Federal Republic
  HSE Translation 7242
  HSE Translation 7242
  International Conference of Directors of Safety in Mines Research, 17th. October 1977, Varna, Bulgaria, 12 p., 1977