With more than 2 million entries, PQD&T offers comprehensive listings for U.S. doctoral dissertations back to 1861, with extensive coverage of dissertations from many non-U.S. institutions. A number of masters theses are also listed. Thousands of dissertations are available full text, and abstracts are included for dissertations from the mid-1980s forward.
EThOS (Electronic Theses Online Service) provides comprehensive listings for doctoral theses from over 100 institutions in the United Kingdom, dating back to the 17th century. Many theses are available in PDF full text, and it possible to request that those not already available be digitized.