I saw a 1968 version in a booksale last week for 50c...nearly bought it.
A lot of what is in those books still holds today, just regurgitated in different words and phrases.
The real important stuff, probably not so applicable, by important, I mean the not 'theocratic fluff' but the real doctrinal stuff.
Oz
oh, and yeah we all though how incredible it was to have these books on the number one most published/ distributed list...i too could have a million seller if i had millions of people hawking my crap too.