ijs
52MILIEU- MT
5211natuurlijk milieu - BT1 water
- BT2 aquatisch milieu
- BT3 fysisch milieu
Mapping
- EXM agrovoc: Agrovoc (FAO - Food and Agriculture Organization)
- EXM gemet: GEMET (GEneral Multilingual Environmental Thesaurus - EEA)
- EXM unbis: Unbis (United Nations Thesaurus)
- EXM unesco: UNESCO (United Nations Educational, Scientific and Cultural Organization)
Dutch)