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• Underwriters Laboratories, Incorporated
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  Report on Thirty-Minute Single-Swinging Wood Covered Composite Fire Doors. U.S. Plywood-Champion Papers, Inc., Algoma, Wisconsin.
  Underwriters Laboratories, Inc., Northbrook, IL
  File R2876-47
  File R2876-47
  March 31, 1971
  19 p.