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2. ASTM D422–63 (2007). Standard test method for particle-size analysis of soils. ASTM International, West Conshohocken, PA.
3. ASTM D854–98 (2014). Standard test method for specific gravity of soils. ASTM International, West Conshohocken, PA.
4. ASTM D5550–14 (2015). Standard test method for specific gravity of soils by gas pycnometer. ASTM International, West Conshohocken, PA.
5. ASTM D2216-19 (2019). Standard test methods for laboratory determination of water (moisture) content of soil and rock by mass. ASTM International, West Conshohocken, PA.