AJG Global Nexus · TOPIC · printable summary
US thesis repositories aggregate the doctoral and master's research output of American universities through both ProQuest Dissertations & Theses Global (the dominant commercial thesis database, covering 5+ million dissertations from 4,000+ institutions globally with comprehensive coverage of US-degree-awarding institutions) and the substantial individual-university institutional-repositories network. The US doctoral-output volume has been historically the world's largest by absolute volume — ~55,000-58,000 PhDs awarded annually as of 2024, though China has surpassed the US in absolute annual PhD output as of 2018-2020.\n\nThe major US university thesis-repositories operate through institutional-repositories at the R1 research universities — the substantial DSpace, Fedora, EPrints, Samvera, and Hyrax-based institutional-repositories at major US universities including MIT (DSpace@MIT, the original DSpace deployment), Harvard (DASH — Digital Access to Scholarship at Harvard), Stanford (Stanford Digital Repository), Berkeley (eScholarship — the University of California system-wide repository), Yale, Princeton, Columbia, NYU, Penn, Chicago, Northwestern, Duke, the broader Big Ten institutional-repositories network. The substantial post-2008 NIH Public Access Policy requiring NIH-funded research deposition in PubMed Central has driven open-access culture for substantial portion of US biomedical research output. The post-2022 NSF Public Access Policy plus the post-2022 OSTP Open Science Memorandum have driven substantial expansion of US-research open-access requirements.\n\nThe ProQuest Dissertations & Theses Global service operates as the dominant commercial thesis aggregator with comprehensive coverage of US doctoral output through agreements with most US-degree-awarding institutions providing automatic thesis submission. The complementary Open Access Theses and Dissertations (OATD), the Networked Digital Library of Theses and Dissertations (NDLTD), CORE, and Google Scholar provide substantial open-access US thesis-discovery infrastructure. The substantial post-2010 emergence of preprint-server adoption in US-research (especially arXiv for STEM, bioRxiv for biology, medRxiv for medicine, SSRN for social sciences) provides additional pre-publication-sharing infrastructure.\n\nThe US doctoral-program landscape has structural distinctness through the substantial international-PhD-student population (US universities collectively enrolled ~140,000 international doctoral students as of 2023-24, with India and China as the largest single-country sources), the substantial federal-research-funding infrastructure (NIH ~USD 47 billion annual research budget, NSF ~USD 9 billion, DOE ~USD 7 billion research budget, plus DOD, DARPA, NASA research budgets), and the post-2020 substantial US export-controls discussion affecting some Chinese-and-Russian-origin researcher access to US research infrastructure.\n\nIndia's engagement with US thesis-and-research infrastructure operates through the substantial Indian-origin doctoral-student presence at major US universities (the substantial post-1990 acceleration of Indian-PhD students in US STEM programs, with continuing growth post-2020 despite some visa-policy fluctuations), plus the bilateral DST-NSF research-collaboration framework, the substantial Indian-American-faculty senior presence at major US research universities (with substantial cross-citation flows between Indian-and-US research), and the post-2024 substantial US-India research-cooperation through the Critical and Emerging Technologies (CET) initiative.\n\nFor a globally-mobile researcher, US thesis-discovery operates uniformly through ProQuest (paywalled), NDLTD/OATD (open-access), individual university institutional repositories, plus Google Scholar and Semantic Scholar.\n\nCross-references: thesis-root-us intersects with thesis-root-aggregators, journal-root-archives, the academy-roots, paper-roots family, the substantial cert-roots ecosystem, work-root-career-paths through US higher-education-and-research employment.