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Is there a global/worldwide database of dissertations? If not, how can I access French, German, Italian, etc. dissertations online?

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I am not aware of an international database, but basically all german dissertations have to be submitted to the German National Library (Deutsche Nationalbibliothek), so if they exist in physical form they can be accessed at the libraries in Frankfurt and/or Leipzig. If they only exist in electronical form, they are still registered at the library. The following link is going to give you a list of all german dissertations that are freely available online: DNB search

The DNB also has a manual about searching for dissertations, however I could only find a german version that is available here

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  • According to DNB, only dissertations since 1998 are available. I find difficulty to find any clues to get access to one dissertation before that time.
    – zhaofeng-shu33
    Mar 9 at 2:37
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For French PhD thesis, the most important repository is TeL. Many university now make it mandatory to deposit one's thesis there, so it has a very good coverage for recent years.

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Dutch doctoral theses can be found at:

http://www.narcis.nl/search/genre/doctoralthesis/coll/publication/Language/en

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Italy

In the past, all PhD dissertations in Italy were to be sent in printed form to the Biblioteca nazionale centrale di Roma. It appears, however, that those dissertations can only be read there. The library has an online catalog which, however, doesn't seem to index the dissertations (from the library's website it appears that the PhD dissertations catalog is only in paper form).

For further information about dissertations deposited there, I suggest you to contact the library directly. There is also an international interlibrary loan service (Prestito Interbibliotecario Internazionale).

Nowadays, instead, all universities in Italy have online repositories, and many recent dissertations should be available from these repositories.

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For German dissertations it is often a requirement that the dissertation is "published", which used to mean published by a publisher, though many universities have made this requirement less strict to allow for the new possibilities of the internet. However, publishing with a publisher is still common practice in many disciplines. This means that many German dissertions are not downloadable from the internet. If you have a concrete dissertation you want to read it can help to contact the author directly, they may be willing to sent you a copy.

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  • I think at least in natural sciences, these days they are usually "published" as a PDF on the university library's website, so most university libraries will have a database with PhD theses.
    – user151413
    Apr 1, 2021 at 21:32
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In Spain the dissertations are listed on the website of the Ministry of Education, and the Network of Spanish University Libraries.

Most theses of Catalan universities can be found in digital form on tdx.cat.

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There is also DART-Europe https://www.dart-europe.org/basic-search.php which aggregates info about openly available European PhDs.

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Some university thesis databases are registered and indexed by the international Open Archives Initiative organization. So you can find links to many theses via their search engine OAIster.

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You can find both master and phd thesis in Turkey from the following website:

https://tez.yok.gov.tr/UlusalTezMerkezi/giris.jsp

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