Consists primarily of the papers of the British publishing firm of Calder & Boyars Ltd. Also included are the papers of its predecessor John Calder (Publishers) and the personal papers of John Calder, 1927- . A few personal papers of Marion Boyars, 1928-1999, are also present.
The Eshleman mss. IV, 1981-1986, consist of correspondence and publishing material between poet Clayton Eshleman and publisher/bookseller Matthew Jennett of Pharos Books.
The Gollancz, Victor mss., 1935-1985, consist of correspondence, reader's reports, and files relating to authors and works published by Victor Gollancz Ltd.
The Haymarket Books mss., 1969-2010, consist of imprints produced by publisher Haymarket Books as well as issues of the International Socialist Review.
The Obscure Publications mss., dates unknown, consist of the correspondence and business files of Obscure Publications, primarily involving editor/publisher Paul Rosheim.
The Peter Owen, Ltd. mss., 1968-1984, consist of correspondence files of the publishing firm Peter Owen, Ltd., London, England, with author, translator Margaret Crosland, 1920- , novelist Rhys Davies, 1903-1978, and writer David Le Vay, 1915- .
The Seaver mss., 1969–1974, consists of the correspondence and documents from the files of Richard Seaver, 1926-2009, the American publisher of Octavio Paz, 1914-1998, concerning the translation and publication of Paz's Alternating Current (translated 1973) and Conjunctions and Disjunctions (translated 1974).