Geotechnical investigation and testing - Identification and classification of soil - Part 1: Identification and description (ISO 14688-1:2017); German version EN ISO 14688-1:2018— 34 стр.
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— 21 стр.