ProQuest Dissertations & ThesesIncludes citations to dissertations and theses from around the world from 1637. Each dissertation published since July 1980 includes a 350-word abstract written by the author. Master's theses published since 1988 include 150-word abstracts. Simple bibliographic citations are available for dissertations dating from 1637. The database offers full text for most of the dissertations added since 1997 and strong retrospective full-text coverage for older graduate works. Other dissertations and theses are available for purchase as printed copies. Included with this database is also ProQuest Dissertations and Theses - UK & Ireland.