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  1. Tentative standard methods of sampling and testing highway materials : adopted by the American Association of State Highway Officials and approved by the Secretary of Agriculture for use in connection with federal-aid road construction
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1924
  2. Department bulletin
    Publication info: Washington, D.C, Supt. of Docs., G.P.O, 1923-1929