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 1: Identification and description (ISO 14688-1:2002+Amd 1:2013) (consolidated version)