Addenbrooke's Hospital Archives include some records of a number of organisations which were connected with Addenbrooke's in the past, such as the constituent hospitals of the United Cambridge Hospitals from 1948-1974; also records of organisations whose membership has included Addenbrooke's staff, such as the Association of Hospital Matrons; and records of organisations above the hospital in the NHS hierarchy, especially between 1974 and 1992, such as Cambridgeshire Area Health Authority.