Geotechnical investigation and testing - Laboratory testing of soil - Part 7: Unconfined compression test (ISO 17892-7:2017); German version EN ISO 17892-7:2018
German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Underground construction work— 21 стр.
German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Horizontal directional drilling works— 17 стр.
German construction contract procedures (VOB) - Part C: General technical specifications in construction contracts (ATV) - Trenchless pipelaying— 17 стр.