2020DIN EN ISO 14688-2:2020-11 Geotechnical investigation and testing Identification and classification of soil Part 2: Principles for a classification (ISO 14688-2:2017); German version EN ISO 14688-2:2018
2018DIN EN ISO 14688-2:2018 Geotechnical investigation and testing - Identification and classification of soil - Part 2: Principles for a classification (ISO 14688-2:2017); German version EN ISO 14688-2:2018
2013DIN EN ISO 14688-2:2013 Geotechnical investigation and testing - Identification and classification of soil - Part 2: Principles for a classification (ISO 14688-2:2004 + Amd 1:2013); German version EN ISO 14688-2:2004 + A1:2013