(Check the minutes in the IEN's, that's
probably the best source of data
on progress of the various implementations.)
Another place to look is Internet Monthly Reports and TCP-IP Digests (oh, I
see you've seen those, I see a reference to one).
I have this distinct memory of Dave Clark mentioning the Liza Martin TCP/IP
for Unix in one of the meeting report publihed as IENs, but a quick look
didn't find it.
Noel