In addition to serving as sources for your own research projects, most doctoral dissertations include exhaustive literature reviews and/or extensive bibliographies, making them incredibly useful for identifying additional sources on a topic.
With more than 2 million entries, PQD&T is the single, central, authoritative resource for information about 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. UMI offers over 1.8 million titles for purchase in microfilm or paper formats. More than 600,000 are available in native or image PDF formats for immediate free download.
American Doctoral Dissertations, 1933-1955 provides electronic access to the only comprehensive record of dissertations accepted by American universities during that time period, the print index Doctoral Dissertations Accepted by American Universities.