ProQuest Dissertations and Theses &#0151 Full text is the world’s most comprehensive collection of dissertations and theses. The official digital dissertations archive for the Library of Congress and the database of record for graduate research. PQDT &#0151 Full Text includes nearly 3 million dissertation and theses citations 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. The database offers full text for most of the dissertations added since 1997 and strong retrospective full-text coverage for older graduate works.