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NCHRP Synthesis 382: Estimating Stiffness of Subgrade and Unbound Materials for Pavement Design (2009)
National Cooperative Highway Research Program Synthesis Program (NCHRPSYN)

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Puppala, Anand J, Transportation Research Board. "Survey Results." NCHRP Synthesis 382: Estimating Stiffness of Subgrade and Unbound Materials for Pavement Design. Washington, DC: The National Academies Press, 2009.

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