Externally-maintained controlled vocabularies
Title: Agrovoc, Multilingual Agricultural Thesaurus
URL: https://agrovoc.fao.org/browse/agrovoc/en/
Maintained by: United Nations Food and Agriculture Organization (FAO)
Label: AGROVOC
Title: Art & Architecture Thesaurus
URL: http://www.getty.edu/research/tools/vocabularies/aat/index.html
Maintained by: Getty Research Institute
Label: AAT
Title: ASFA Thesaurus
URL: https://agrovoc.fao.org/skosmosAsfa/asfa/en/
Maintained by: Aquatic Sciences and Fisheries Information System (ASFIS)
Label: ASFAT
Title: Canadian Taxonomy of Human Services
URL: https://211taxonomy.org/
Maintained by: 211 of LA County, in collaboration with InformCanada Federation
Label: CTHS
Title: Dewey Decimal Classification (DDC)
URL: www.oclc.org/dewey/about/
Maintained by: OCLC
Label: DDC
Title: Global Change Master Directory (GCMD)
URL: https://ceos.org/ourwork/workinggroups/wgiss/access/international-directory-network/
Maintained by: NASA
Label: GCMD
Title: Integrated Taxonomic Information System (ITIS): Taxon based biological information system
URL: https://www.itis.gov/
Maintained by: Smithsonian Institution
Label: ITIS
Title: Library of Congress Classification Outline
URL: www.loc.gov/catdir/cpso/lcco/lcco.html
Maintained by: Library of Congress
Label: LCC
Title: Library of Congress Subject Headings (LCSH)
URL: http://id.loc.gov/authorities/subjects.html
Maintained by: Library of Congress
Label: LCSH
Title: Medical Subject Headings
URL: www.nlm.nih.gov/mesh/
Maintained by: U.S. National Library of Medicine
Label: MESH
Title: National Library of Medicine Classification
URL: https://classification.nlm.nih.gov/
Maintained by: U.S. National Library of Medicine
Label: NLMC
Title: OECD Macrothesaurus - HTML Version
URL: http://bibliotecavirtual.clacso.org.ar/ar/oecd-macroth/en/index.htm
Maintained by: Organisation for Economic Cooperation and Development
Label: OECDMT
Title: Répertoire de vedettes-matière (RVM)
URL: https://rvmweb.bibl.ulaval.ca/rvmweb/accueil.do?locale=en
Maintained by: Université Laval
Label: RVM