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ASTM D 2487 - 93 ; ASTM D 2487 - 00 Standard classification of soils for engineering purposes (United soil classification system)
1) 1997 Annual Book of ASTM Standards. Section 4 Construction, Volume 04.08 Soil and Rock (I) 2) Annual Book Of Astm Standards 2006 Soils And Rock (i) Vol. 04.08
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