(1955). Standard specifications for highway materials and methods of sampling and testing (7th ed.). Washington, D.C: American Association of State Highway Officials.
Παραπομπή Chicago StyleStandard Specifications for Highway Materials and Methods of Sampling and Testing. 7th ed. Washington, D.C: American Association of State Highway Officials, 1955.
Παραπομπή MLAStandard Specifications for Highway Materials and Methods of Sampling and Testing. 7th ed. Washington, D.C: American Association of State Highway Officials, 1955.
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