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• Underwriters Laboratories, Incorporated
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  Report on 8 In. Bearing Wall of Concrete Masonry Units With the Core Holes Filled With Perlite Aggregate. Perlite Institute, New York, New York.
  Underwriters Laboratories, Inc., Northbrook, IL
  File R3453-6
  File R3453-6
  July 9, 1969
  18 p.