I too wanted to find the latest edition of The Pentax Way by Herbert Keppler, and I found only up to the 11th (Focal Press,1979) out there for sale.
I bought a nice copy from a thrift shop on abebooks at only about $6 and it has a ton of interesting material going up through the M series.
But I really wanted to see the LX info, because I had read in one description that there was a reprint that added that. Check out this note about the booklet in the back:
The Asahi Pentax Way, 11th ed. (with supplement), by Herbert Keppler.
Published in 1980 by Focal Press Limited; ISBN 0 240 51018 6. General introduction to photography using Pentax equipment; specific discussion of Spotmatics, K-series, and M-series (ME, ME Super, MV, MV-1, and MX) as well as mention of earlier models. Green 32-page supplement bound at the end of the book describes the LX and its system accessories (including AF280T and AF400T TTL flashes). Although the supplement contains little LX-specific information that isn't also present in the LX Operating Manual, the additional accessory information can be useful. (taken from
ReoCities)
I assume most of these books swimming around have lost track of their special supplement.
As of today a UK bookseller on abebooks is listing a copy with the bonus green book, but he wants more than $60 to send it here.
His description includes: "444 pages + 32 pages of Pentax LX + further 23 page booklet housed in back pocket of inside end cover"
So I ask you PFers, who among you has seen this edition of the Asahi Pentax Way? Opinions on its value to you if you love the LX? Willing to throw up a few scans of that phantom booklet.