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 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).