(1974). Standard specifications for transportation materials and methods of sampling and testing (11th ed.). Washington: AASHTO.
Παραπομπή Chicago StyleStandard Specifications for Transportation Materials and Methods of Sampling and Testing. 11th ed. Washington: AASHTO, 1974.
Παραπομπή MLAStandard Specifications for Transportation Materials and Methods of Sampling and Testing. 11th ed. Washington: AASHTO, 1974.
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