The Integrated Authority File (GND) is an authority file for Persons, Corporate bodies, Conferences and Events, Geographic Information, Topics and Works. It is operated cooperatively mostly by German libraries. Its content can be used under CC 1.0 in multiple formats.
GND is being mapped to several other knowledge organization systems.
See the concordance registry for GBD-DDC mappings also stored in the GND data. Additional mappings are counted daily:
See Wikidata concordances for mappings from Wikidata to GND, harvested daily.
See the Concordance registry.