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Cita Chicago (17th ed.)National Research Council (U.S.). Highway Research Board, National Research Council (U.S.). Highway Research Board. Meeting, i National Research Council (U.S.). Committee on Characteristics of Bituminous Materials. Asphalt Mixture Characterization and Asphalt Grading: 10 Reports Prepared for the 51st Annual Meeting. Washington: Highway Research Board, 1972.
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