Proquest Dissertations & Theses Global
Includes citations to dissertations and theses from around the world. Dates range from European dissertations from the 17th century, to the first U.S. dissertation accepted in 1861, to those accepted as recently as last semester.
Lists most dissertations for colleges and universities in the United States and Canada and a great many from around the world.
Networked Digital Library of Theses and Dissertations (NDLTD)
Contains more than a million records of electronic theses and dissertations from the early 1900s to the present.
American Doctoral Dissertations is a subset of NDLTD. Began as an archive of dissertations from 1933-1955; now has current content provided by participating institutional repositories.
DART-Europe E-theses Portal
Provides researchers with a single European Portal for the discovery of electronic theses and dissertations.