A primary resource
The search features are powerful. The ability to enter a single word or phrase, and find all instances of, is immensely helpful in my studies.
This is the second edition, not the current fourth edition. The differences are minor and so subtle you may not recognize them. There has been extreme reticence over the years on the part of the active sober members of Alcoholics Anonymous to change anything in the Big Book ... "IF IT WORKS, DONT FIX IT" ... All changes made have been minor in nature, and reflecting the growth of the Fellowship.
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12 Steps Companion AA Big Book, v2.5.1