calciu
68INDUSTRIE- MT
6816metalurgie şi siderurgie - BT1 metale neferoase
- BT2 metale
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)
Romanian)