I use it a lot as reference. I have read that it was not approved because of "errors" which I don't know if that means it had information different from the approved literature.?
It really is detailed with great history and stories.
Description:
"The History of AA" by Bob P.
Submitted to the GSC but was unapproved. Not sure why, but whatever. This still contains a lot of great information and is an excellent work.