Many dissertations are available in full text through ProQuest's electronic resource Dissertations & Theses which can be searched through the catalog.
Some full text dissertations from the United Kingdom are available via EThOS from the British Library or via ProQuest's Dissertations & Theses: UK & Ireland. Additional foreign dissertations may be available online via the Center for Research Libraries. (NOTE: Following a major cyber attack in late 2023, the British Library collections are slowly coming back online. The full collection may not be available.)