I can't help you specifically but I note that that tape would've held some posts
from mid-1990 and want to wonder out loud:
Wonder if the same posts were on the "Usenet CD-ROM's" that were sold (or
maybe just discussed) in the early 90's.
"Sterling Software" is one name associated with that but I also remember a
Vancouver BC based company doing similarly.
Likely I just replaced an unreadable tape with an unfindable CD. I have no idea if the
"sell-usenet-on-CD's" ever actually sold any.
Tim.