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.The General Service Conference has also dealt with the meaning of the term "Conference Approved" in a "Conference Approved" pamphlet (SM F-29) called: Conference-Approved Literature. Here it is explained this way:
What any A.A. member reads is no business of G.S.O., or of the Conference, naturally.
"Conference-approved?" What It Means to YouBooks like the Original Manuscript and the First Edition of the Big Book are not Conference Approved Literature since there was no conference at the time they were published.
The term has no relation to material not published by G.S.O. It does not imply Conference disapproval of other material about A.A. A great deal of literature helpful to alcoholics is published by others, and A.A. does not try to tell any individual member what he or she may or may not read. See: http://www.aa.org/en_pdfs/smf-29_en.pdf
1968: Conference-approved literature and G.S.O. Guidelines be displayed and distributed at assembly meetings. 1972: It be suggested that when a local A.A. facility (central office, intergroup, group, etc.) sells non-Conference-approved literature, it be clearly designated as such. 1977: It was suggested that A.A. groups be discouraged from selling literature not distributed by the General Service Office and the Grapevine. 1986: The spirit of the 1977 Conference action regarding group literature displays be reaffirmed, and recommended the suggestion that A.A. groups be encouraged to display or sell only literature published and distributed by the General Service Office, the A.A. Grapevine and other A.A. entities.
The full literature guidelines are available here
The first AA group in Akron, Ohio (still going today) continues to display the Bible that AA's founders read from in the earliest meetings. What Bill or Bob would have considered fine literature to read in a meeting would surely spark outrage in some groups today.