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4. ASTM: Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils, D4318-17e1. American Society for Testing and Materials, West Conshohocken, PA (2017a)
5. ASTM: Standard Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis, D6913/D6913M-17. American Society for Testing and Materials, West Conshohocken, PA (2017b)