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3. ASTM Standard D6913 (2009) Standard test methods for particlesize distribution (gradation) of soils using sieve analysis. ASTM International, West Conshohocken, PA
4. ASTM Standard D4318 (2010) Standard test methods for liquid limit, plastic limit, and plasticity index of soils. ASTM International, West Conshohocken, PA.
5. ASTM Standard D2487 (2011) Standard practice for classification of soils for engineering purposes. ASTM International, West Conshohocken, PA