7th edition available in 1983?

[Weightshift]

http://tinyurl.com/67c654

---- quote ----
Homer Notes

These were taken off a series of audio tapes with Mr. Kelley conducting an AI class. This post is fairly long but I think everyone will enjoy.

NOTES FROM HOMER'S AUDIO TAPES

Homer states on these tapes that all of the research is now complete with the printing of the 7th Edition.
---- end quote ----

When was the 7th edition published? I thought the 7th edition was not available (in 1983) when Homer died?

(I was searching for "Law of the flail" on Google And found this reference.. http://72.14.205.104/search?q=cache:...lnk&cd=2&gl=ca

..which I shortened to http://tinyurl.com/67c654