This collection consists of several apazines to which Prentiss Riddle contributed individual zines. The APAs represented are Argos and Myriad, which take as their subject science fiction, and Lingua (later titled Linguica), which involves explorations of language and languages. The collection contains a few additional materials, including individual zines.

Fanlore.org defines an "apa" (or "amateur press association") as "a kind of fan publication in which all the materials, generally letters, would be sent to a central person, who would simply copy the entire packet in the cheapest possible way (e.g. mimeograph, spirit duplicating, xerography, offset printing; APAs far predate the photocopy machine.) Sometimes each of the contributors sends as many copies of their submission as there are subscribers to the central mailer of the zine, who then collates and mails these, and does not have to take care of the printing.

APAs were, and are, important media for fannish conversation, discussion, and interaction: sort of a fannish mailing list or LiveJournal in print sent by snail mail. "

Apa members were expected to make regular or at least periodic contributions to the mailings (called "minac", or MINimum Activity). The role of the Central Mailer, sometimes called an Official Editor or Central Editor, often rotates between members of the apa. In addition, apa participants often change the title and/or format of their apazines from time period to time period. For example, Prentiss Riddle changed the title of his contributions almost monthly between issues of the apas of which he was a member.