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24 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. AMRL Web Site: http://www.nist.gov/amrl 3. ASTM Book of Standards, Vol. 04.08, Soil and Rock, West Conshohocken, PA, 2008. 4. ASTM Standards on Precision and Bias for Various Applications, Fifth Edition, West Conshohocken, PA, 1997. 5. 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. 6. National Cooperative Highway Research Program (NCHRP) Web-Only Document 71 (Project 09-26, Phase 3), âPrecision Estimates for AASHTO T308 and the Test Methods for Performance-Graded Binder in AASHTO Specification M320.â http://onlinepubs.trb.org/Onlinepubs/nchrp/nchrp_w71.pdf. 7. Ku, Harry H., âStatistical Concepts in Metrology,â NIST Special Publication 300, Volume 1, 1969: p 316-40.