A COMPARISON OF ONE AND ONE-HALF INCH AND THREE-QUARTER INCH MAXIMUM SIZE AGGREGATE IN CONCRETE

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

  • Supplemental Notes:
    • Hpr-1(5), D-3-17
  • Corporate Authors:

    California Division of Highways

    Bridge Department
    Sacramento, CA  USA  05914
  • Authors:
    • Spellman, D L
    • Ames, W H
    • Woodstrom, J H
  • Publication Date: 1967-6

Subject/Index Terms

Filing Info

  • Accession Number: 00212019
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Oct 23 1994 12:00AM