Note that some of these databases only index journal articles—they don't actually have the full text. Use the gold UC-eLinks or the Get it at UC button - to do an automated search to find the full text, or search for the journal title in the UC Library Search catalog.
Example Searches in PubMed:
Index to doctoral dissertations from 1637 to the present, with abstracts since 1980. A number of master's theses are also indexed, with abstracts since 1988. Many are available for download in pdf format. UCLA has access to all full text dissertations in the database. Non-UCLA users may use Dissertations Express to purchase digital or print copies of individual dissertations.