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19 REFERENCES 1. AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and Testing (Part 2 â Tests), Twenty-Eight Edition, American Association of State Highway and Transportation Officials, Washington, DC. 2008. 2. AASHTO Standard Specifications for Transportation Materials and Methods of Sampling and Testing (Part 1A â specifications), Twenty-Eight Edition, American Association of State Highway and Transportation Officials, Washington, DC. 2008. 3. AMRL Web Site: http://www.nist.gov/amrl 4. ASTM Standards on Precision and Bias for Various Applications, Fifth Edition, West Conshohocken, PA, 1997.