The PDP-11 Unix Preservation Society (PUPS) maintains an archive of many historically-significant and otherwise interesting UNIX distributions. Highgate is one of about a dozen sites globally that mirror the contents of the master PUPS archive.
With the recent upgrades to highgate, the local archive has been offline for a couple of months. I am pleased to report that it is now back online. I need to get the process which synchronizes the local copy with the master site on a daily/weekly basis running again, but this should be completed shortly.
You can access the PUPS Archive at highgate.comm.sfu.ca/pups. Have fun!