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ProQuest dissertations and theses [North America & Europe: index from 1861; abstracts from 1980; EndNote Filter]
Index to Theses with Abstracts Accepted for Higher Degrees in Great Britain and Ireland [index from 1716; abstracts from 1970]
Networked Digital Library of Theses and Dissertations
Deutsche Bibliothek Frankfurt am Main
SUDOC [France: click on the British flag, select "catalogue", "extended search" and limit by "dissertation"]
theses-ON-line [France: click on "english version" and select Search or Browse. Abstracts in English and French]
TESEO [Spain: from 1976. Enter title (titulo) and/or author (autor), click Search (Buscar). Thesaurus search also available. Spanish only]