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4. ASTM D 4318-00 (2003) Standard test methods for liquid limit, plastic limit and plasticity index of soils. Annual Book of ASTM Standards. American Society For Testing and Materials, West Conshohocken, PA, pp 582–593
5. ASTM D 698-00a (2003) Standard test method for laboratory compaction characteristics of soil using standard effort. Annual Book of ASTM Standards. American Society For Testing and Materials, West Conshohocken, PA, pp78–87