DIN EN ISO 14688-2:2020 岩土工程调查和试验. 土壤的识别和分类. 第2部分: 分类原则(ISO 14688-2-2017); 德文版 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