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ASA - The Library Catalog
ProQuest Dissertations and Theses Global
Comprehensive collection of dissertations and theses from North America and the UK, offering millions of works from thousands of universities. Includes abstracts for most documents and full-text for about half of the database, weighted toward more recent years.
Global coverage note: also covers Europe less comprehensively, and many Chinese universities after 2017. Coverage of other countries and non-English language documents is limited.