Yes that is 519A which is not the same as the one I found called just 519. 519A was published 1981, 519 seemingly in 1979.

There are a few papers circa 1980 that cite an AI Lab memo with this title and give a date of 1979 [1], so there must indeed have been a version circulated earlier than the 1981 "A" version. Have you tried contacting the CSAIL archivist to see if they'd be interested in putting up a non-A version of 519?

[1] http://dl.acm.org/citation.cfm?id=802784, http://dl.acm.org/citation.cfm?id=990280

Yes I emailed them when I found it but got no response. I will email them again and see if they are interested.

Is this it?

https://ia601004.us.archive.org/32/items/MITAIMemo519/MIT-AI...

Yes that is the document I uploaded to IA, linked to it in my first comment.

Whoa, funny. I read half of this conversation last night, and the second half today, and mistakenly thought you were still looking for that document having forgotten what I read last night. I will leave my embarrassingly ridiculous comment above for posterity.