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• Crooks, T. P.; Stawitcke, F. A.; Tobey, S.; DeCola, C. R.
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  Air-Supplied Respirator for Underground Coal Miners. Final Report.
  Synsis, Inc., Los Angeles, CA
  Technical Report 73S-3
  Department of Health, Education, and Welfare, Washington, DC, Technical Report 73S-3
  June 1972
  205 p.