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Continue to ChatAASHTO 2013 Standard Specs for Sampling and Testing https://geoprac.net/2013/07/aashto-2013-standard-specs-for-sampling-and-testing/
AASHTO 2013 Standard Specs for Sampling and Testing https://geoprac.net/2013/07/aashto-2013-standard-specs-for-sampling-and-testing/