# Authorities

- [Local subject headings](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/local-subject-headings.md)
- [Genres](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/local-subject-headings/genres.md)
- [Time periods](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/local-subject-headings/time-periods.md)
- [Local subjects](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/local-subject-headings/local-subjects.md)
- [Subject headings](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/subject-headings.md)
- [Library of Congress (LC)](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/subject-headings/library-of-congress-lc.md)
- [Medical subject headings (MeSH)](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/subject-headings/medical-subject-headings-mesh.md)
- [Homosaurus](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/subject-headings/homosaurus.md)
- [Undocumented, enslaved and indigenous people](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/subject-headings/undocumented-enslaved-and-indigenous-people.md)
- [Authority Maintenance](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/authority-maintenance.md)
- [Quarterly Backstage updates](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/authority-maintenance/quarterly-backstage-updates.md)
- [Authorities at Wellcome](/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/authority-maintenance/authorities-at-wellcome.md)