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- Agrovoc (agricultural concepts)
- DBpedia (general knowledge)
- FAST (general subject headers from OCLC, derived from LoC subject headers)
- GeoNames (places in the real world)
- Getty (content relating to artistic works)
- AAT (concepts)
- ULAN (persons and organizations)
- TGN (places)
- Library of Congress
- Genre
- Name
- Subject
- MeSH (NLM medical subject headings)
- NALT (National Agricultural Library Thesaurus)
- VIAF (authority cross-walks)
All of these services, including versions supporting human interaction with the results, are available at http://services.ld4l.org/ld4l_services/index.jsp.
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