ProQuest Dissertations and Theses (PQDT) database is the world's most comprehensive collection of dissertations and theses. PQDT includes nearly 3 million searchable citations to dissertations and theses from around the world from 1861 to the present day together with over 1 million full-text dissertations that are available for download in PDF format. Over 2 million titles are available for purchase as printed copies. The database offers full text for most dissertations added since 1997.
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. Basic bibliographic citations are available for older dissertations. Where available, PQDT provides 24-page previews of dissertations and theses.