Halvedelsteiner
type: Concept
notation: 553.87
narrower: Opaler

Opaler
type: Concept
notation: 553.873
broader: Halvedelsteiner
alternative label: Opaler--økonomisk geologi
created: 2010-02-04
in scheme: Norsk WebDewey
modified: 2018-07-26

Norsk WebDewey
type: ConceptScheme