[brlcad]

I have the sources to "JHU UNIX" which were a direct fork of one of the earliest BSD's, though I don't recall hearing which. They were recovered off data tapes (and are still in an arcane raw binary format) from the late 70's / very early 80's.

[mprovost]

Cool! It might be worth getting in touch with Diomidis Spinellis who runs the Unix History Repository and see if they're interested in adding them.

https://github.com/dspinellis/unix-history-repo