Files in this subseries hold correspondence between Altschul and authors, editors, illustrators, and others regarding the design and publication of books, broadsides, and pamphlets. Many also contain drafts, proofs, or final copies of broadsides and pamphlets. In general, files are arranged alphabetically by author and contain correspondence related to the publishing of a single work, though in some cases they may cover several works by the same author. It is unclear whether this arrangement is original or was imposed at a later date.