> 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/undocumented-enslaved-and-indigenous-people.md).

# Undocumented, enslaved and indigenous people

We use MARS (MARC Record Service) for outsourcing authority control which is managed by Backstage Library Works.

As part of the quarterly authority loading process, Backstage replaces specific/relevant subjects headings with terms from the following controlled vocabularies:

Undocumented Migrants (undoc)\
Enslaved People (enslv)\
Indigenous people (indig)

{% hint style="info" %} <mark style="background-color:blue;">**650 7**</mark>Indigenous peoples<mark style="background-color:blue;">**|z**</mark>Amazon River Region<mark style="background-color:blue;">|v</mark>Exhibitions.<mark style="background-color:blue;">**|2**</mark>indig
{% endhint %}