Series includes correspondence from writers, Bogg readers, and other associates in Elsberg's circle providing reactions and comments on Bogg and works published within Bogg. Many comments were then published and used in the "Feedback" section of Bogg. Also includes some correspondence related to items published by Bogg Publications.

Most of this series came to Spencer Research Library organized by issue number. A few pieces of correspondence initially ordered in the Correspondence series but marked "Feedback" by Elsberg were removed to this series to better match the intended arrangement and make these materials easier to find.