The Carboniferous Amateur Press Alliance or CarbAPA, an APA founded in 1961 which included the five original members of Fifth Fandom. The original members were Rick Sneary, Len Moffatt, Art Rapp, Ed Cox, and Roy Tackett (and their wives as associate members).

Members in 2017 include Ray Nelson, Barbara Harmon, June Moffatt, Jon D. Swartz, who replaced Howard DeVore, and John L. Coker, III who replaced Ben Singer. All current members are also members of First Fandom, and Coker is the current First Fandom president.

The monthly publication, titled Five X Five, has included the following apazines (* indicates current members):

Contributors and Apazines:

This is an APA page. Please extend it by adding information about when and by whom it was published, it's reason for being, its contents, members, apazines which appear in it, its impact on fandom, or by adding scans or links to scans.