Water Quality - Guidance standard on monitoring freshwater pearl mussel (Margaritifera margaritifera) populations and their environment; German version EN 16859:2017— 52 стр.
Geotechnical investigation and testing - Identification and classification of soil - Part 1: Identification and description (ISO/DIS 14688-1:2016); German and English version prEN ISO 14688-1:2016
Guidance standard on monitoring freshwater pearl mussel (margaritifera margaritifera) populations and their environment; German and English version prEN 16859:2015
