What is Conference Approved literature?
From GSO Box 4-5-9 (Volume 23, No 4)
"It (Conference Approved) does not mean the Conference disapproves of any other publications. Many local A.A. central offices publish their own meeting lists. A.A. as a whole does not oppose these, any more than A.A. disapproves of the Bible or any other publications from any source that A.A.’s find useful. What any A.A. member reads is no business of G.S.O., or of the Conference, naturally. "
An in depth and informative study of this question can be found on Barefoot's World a great site with tons of information on the program, fellowship and history of Alcoholics Anonymous.
another good source for A.A. history Dick B.