DISSERTATIONS & THESES (ProQuest) The database «Dissertations & Theses» covers approximately 99% of American doctoral theses since 1861 and Canadian doctoral theses. In addition, British doctoral theses since January 1988 are documented. Doctoral theses from over 1,000 universities and colleges worldwide can also be found. The bibliographical information on doctoral theses since July 1980 is supplemented by an abstract of approximately 350 words, written by the author. Master’s theses from 1988 include a 150-word abstract. For doctoral theses from 1997 on, a 24-page preview is often available in PDF format. The information is updated monthly. Manual Earlier database name: Dissertation Abstracts.