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• Underwriters Laboratories, Incorporated
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  Report on Acoustical Materials, Mineral and Fiber Boards and Steel Framing Members Used in a Floor and Ceiling Construction. National Gypsum Co., Buffalo, New York.
  Underwriters Laboratories, Inc., Northbrook, IL
  File R4337-39
  File R4337-39
  April 14, 1971
  31 p.