Selected archives at the Medical Historical Library and Manuscripts and Archives:
Orbis to find books, journals, and other materials
Quicksearch for broadly searching multiple Yale databases
Worldcat or finding collections around the world
JSTOR for scholarly journal articles
America History and Life for scholarly journal articles
Historical Abstracts for history outside the United States
History of Science, Medicine, and Technology for history of medicine
Project Muse for a variety of scholarly articles in the humanities and social sciences
Academic Search is a larger database that goes through a number of current periodicals, scholarly, popular and trade