W. F. Bynum & Roy (Deceased, literary executor and royalty recipient is Natsu Hattori, his wife.) Porter 
Companion Encyclopedia of the History of Medicine [PDF ebook] 

This is a comprehensive reference work which surveys all aspects of the history of medicine, both clinical and social, and reflects the complementary approaches to the discipline. The editors have assembled an international team of scholars to provide detailed and informative factual surveys with contemporary interpretations and historiographical debate.
Special Features
* Comprehensive: 72 substantial and original essays from internationally respected scholars
* Unique: no other publication provides so much information in two volumes
* Broad-ranging: includes coverage of non-Western as well as Western medicine
* Up-to-date: incorporates the very latest in historical research and interpretation
* User-friendly: clearly laid out and readable, with a full index of Topics and People
* Indispensable: essential information for study and research, including bibliographic notes and cross-referencing between articles.