NS-EN ISO 22475-1:2006 Geotechnical investigation and testing — Sampling methods and groundwater measurements — Part 1: Technical principles for execution (ISO 22475-1:2006)
2007NS-EN ISO 22475-1:2006 Geotechnical investigation and testing — Sampling methods and groundwater measurements — Part 1: Technical principles for execution (ISO 22475-1:2006)