Deals with the "mechanics" and results of collaboration between poets and writers through essays contributed by the participants. -- Source of annotation: Marvin or Ruth Sackner.

Book consists of a visual/verbal collaboration between Crozier and his student, Robert Kelly. -- Source of annotation: Marvin or Ruth Sackner.

In response to Loeffler's request for a critical essay for his "Book on Correspondence Art" Crozier describes what it would be like to receive work from his colleagues in the mail art network. The narrative mentions over 450 names, all listed in alphabetical order. Mentions "Marvin Sackner who is the only non-artist in here or is he now..." -- Source of annotation: Marvin or Ruth Sackner.

Vittore Baroni, Robert Filliou, Bill Gaglione, Edgardo Antonio Vigo, William Xerra, Nicholas Zurbrugg, Lon Spiegelman, Marvin A. Sackner, Takako Saito, Eugenio Miccini, Clemente Padín, and Richard Kostelanetz are some of the names associated with this letter.