If you know a repo I don't have here, let me know
http://www.nesssoftware.com/home/mwc/source.php
(Considered buying Coherent way back in the day)
There is an empty repo by this name in your project so I'm a bit confused whether this one is supposed to be included:
https://github.com/dspinellis/unix-history-repo
You can read about it here: https://www2.dmst.aueb.gr/dds/pubs/jrnl/2016-EMPSE-unix-hist...
(link is from the github README)
For instance, it's not clear whether it has any overlap with the Unix Heritage Society's repos: https://github.com/TUHS
(edit: although TUHS github presence is decidedly anemic!)
If you know a repo I don't have here, let me know