Other finding aids
ProQuest Dissertations & Theses Global
ProQuest Dissertations & Theses Global is a collection of 5 million citations and 2.5 million full-text works from thousands of universities all over the world. Full-text coverage spans from 1743 to the present, with citations dating back to 1637.
Library Hub Discover
You can use Library Hub Discover to search the online catalogues of some of the UK’s largest university research libraries to see if the thesis has been purchased by another UK library. These theses may be obtained by current members of Oxford University via inter-library loan.
Open Access Theses and Dissertations (OATD)
Use OATD to find open access graduate theses and dissertations published around the world.
Individual universities
You can also go to individual US universities' sites for their online theses repositories.