> For the complete documentation index, see [llms.txt](https://docs.wellcomecollection.org/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wellcomecollection.org/library-cataloguing/9yMHsFGBXS9DDRGtdmSE/authorities/subject-headings/library-of-congress-lc.md).

# Library of Congress (LC)

<https://id.loc.gov/authorities/subjects.html> (preferred for subjects)

<https://authorities.loc.gov/> (preferred for names/series)