NOTE: Most of the medical entries date from 1991 to 2004, so to locate earlier works on the history of medicine it is best to consult the Subject Catalogue of the History of Medicine and Related Subjects (Osler Ref folio ZW 1 W447s 1980 - 18 volumes), published by the Wellcome Library, for the period 1900-1978. Material from 1979-1991, and a great deal more, can be found in the The Wellcome Library online catalogue, which contains records for books, book chapters, journal articles, reports, pamphlets, theses, patents and images.