calcium
68INDUSTRIE- MT
6816metaal- en staalindustrie - BT1 non-ferrometaal
- BT2 metaal
Mapping
- EXM agrovoc: Agrovoc (FAO - Food and Agriculture Organization)
- EXM gemet: GEMET (GEneral Multilingual Environmental Thesaurus - EEA)
- EXM unesco: UNESCO (United Nations Educational, Scientific and Cultural Organization)
Dutch)