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3. ASTM D2487 (2017) Standard practice for classification of soils for engineering purposes (Unified Soil Classification System). ASTM International, West Conshohocken
4. ASTM D4253-00 (2006) Standard test methods for maximum index density and unit weight of soils using a vibratory table. ASTM International, West Conshohocken
5. ASTM D4254-00 (2006) Standard test methods for minimum index density and unit weight of soils and calculation of relative density. ASTM International, West Conshohocken