Covers literature from 1947 to 1965. You may also be interested in Ovid MEDLINE which covers from 1948 to roughly the 3 months ago. To search more current in-process or other non-indexed citations you may be interested in Ovid MEDLINE In-Process & Other Non-Indexed Citations which is updated daily.
Ovid OLDMEDLINE
To search a complete list of information resources visit CLIO, the library catalog.