1970AASHTO T 206-2019 Standard Method of Test for Penetration Test and Split-Barrel Sampling of Soils
1970AASHTO T 206-2003 Standard Method of Test for Penetration Test and Split-Barrel Sampling of Soils
1987AASHTO T 206-1987 Standard Method of Test for Penetration Test and Split-Barrel Sampling of Soils HM-22; Part IIB; ASTM Designation D 1586-99 R(2000)