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There is no single source for a comprehensive dissertation search. WorldCat and ProQuest Dissertations and Theses Global include most American dissertations. Dissertations @ The Center for Research Libraries lends non-American dissertations to member borrowers. Library catalogs and specialized repositories contain other titles. Request any dissertation through Interlibrary Loan. Though not every title is available through ILL, it is worth a try.
For more information on finding or depositing dissertations and theses, see the Dissertations & Theses guide.