πάγος
52ΠΕΡΙΒΑΛΛΟΝ- MT
5211φυσικό περιβάλλον - BT1 νερό
- BT2 υδάτινο περιβάλλον
- BT3 φυσικό περιβάλλον
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)
Greek)