Indexing, abstracts, and full text for doctoral dissertations and master's theses. Dissertations published from 1980 forward include 350-word abstracts written by the author. Master's theses published from 1988 forward include 150-word abstracts. Full text generally available from 1997-present; 1.2 million full text dissertations available in pdf format. Includes 2.7 million searchable citations to dissertations and theses from around the world since 1861 to present. Simple citations for dissertations dating back to 1637.