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3. ASTM D4633-16 (2016) Standard test method for energy measurement for dynamic penetrometers. ASTM International, West Conshohocken.
www.astm.org
4. ASTM D4253-14 (2014) Standard test methods for maximum index density and unit weight of soils using a vibratory table. ASTM International, West Conshohocken.
www.astm.org
5. ASTM D4254-14 (2014) Standard test methods for minimum index density and unit weight of soils and calculation of relative density. ASTM International, West Conshohocken.
www.astm.org