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2. American Society for Testing Materials (ASTM) D-422: Standard Test Method for Particle-Size Analysis of Soils. ASTM International, USA (2007)
3. American Society for Testing Materials (ASTM) D-4253: Standard Test Methods for Maximum Index Density and Unit Weight of Soils Using a Vibratory Table. ASTM International, USA (2006)
4. American Society for Testing Materials (ASTM) D-4254: Standard Test Methods for Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density. ASTM International, USA (2006)
5. American Society for Testing Materials (ASTM) D-854: Standard Test Methods for Specific Gravity of Soil Solids by Water Pycnometer. ASTM International, USA (2014)