kaltsium
68TÖÖSTUS- MT
6816metalli- ja terasetööstus - BT1 mitteraudmetall
- BT2 metall
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)
Estonian)