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Dissertations are unpublished book-length manuscripts completed in order to earn a Ph.D. Master Degree theses are generally shorter, focused and well-documented research papers. Various subject-based databases index and abstract dissertations and some theses. These include:
The Dissertations and Theses database from ProQuest cites 2.3 million works issued by graduate institutions in North America and beyond from 1861 to the present. PDF full texts of most UC dissertations starting about 1997 are available online at no charge.
To limit to ETDs, click on the thesis box in the menu on the left. To limit to a particular campus, select the drop down option and the campus you want to search. In the upper right hand corner, you can search by keywords -- for example anthropology master to limit to Anthropology M.A. theses. If you know the name of the athor or title of the thesis or dissertation you are looking for, you can also resort that way and browset through to find it alphabetically.