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 Hastings mss., 1960, consists of the writings of playwright and novelist Michael Hastings, 1938-2011, and a letter to Hastings from novelist Bill Hopkins, 1928-2011.
The Sieveking mss., 1724-1971, consists of the papers of Lancelot (Lance) de Giberne Sieveking, 1896-1974, author, playwright, and pioneer of BBC radio programming.
