If you are interested in the history of medicine in New York you may want to look at the Broome County Medical Society Collection. The Society began in 1806 and will have their bicentennial celebration next year. In the collection are materials from their Centennial and Sesquicentennial (150 years) celebrations, including a ticket for the Sesquicentennial dinner.
The BCMS collection has biographical information on several 19th century local physicians, included Dr. Nathan Smith Davis, the founder of the the American Medical Association. The are also minute books from 1806 to 1943, photographs, glass magic lantern slides, medical diplomas and certificates, 19th century medical journals, and much, much more.