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- Papyrus : Dépôt institutionnel numérique de l'Université de Montréal (Canada)
- PoisonCentre.be : Centre antipoisons de Belgique / Belgisch Antigifcentrum (internal document repository)
- Portfolio@Duke University (USA)
- Pandektis: Digital Thesaurus of Primary Sources for Greek History and Culture, National Documentation Centre (Greece)
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- SAS Space E-Repository (School of Advanced Study, University of London (UK)
- ScholarsArchive@OSU (USA)
- ScholarSpace at University of Hawaii at Manoa, (USA)
- School of Forestry, Northern Arizona University (USA)
- School of Information, University of Texas at Austin (USA)
- Science and Technology Knowledge Services (Thailand)
- Sharing Environment and Ecology Knowledge Space (China)
- Shinshu University Institutional Repository (Japan)
- SIM University, SG (Singapore)
- Simon Fraser University, BC (Canada)
- SISSA Digital Library (Italy)
- Sistema Bibliotecario de la Educación Superior Universitaria Estatal de Costa Rica
- SMARTech Scholarly Materials and Research at Georgia Tech (USA)
- Smithsonian Institution (USA)
- SNAP - Soros Network Archival Portal (Hungary)
- Sripatum University Library Knowledge Bank (Thailand)
- stadtteilgeschichten.net - Digital Archive of Neighbourhood Histories, Hamburg (Germany)
- SSPAL.doc Scuola Superiore della Pubblica Amministrazione Locale (Local public administration school)
- State University of New York, System Administration (USA)
- Stellenbosch University Scholar (South Africa)
- Stellenbosch University ETD (South Africa)
- Stellenbosch University CIB (South Africa)
- SUTIR - Suranaree University Of Technology Intellectual Repository, The Center for Library Resources and Educational Media, Suranaree University Of Technology (Thailand)
- Swansea University (Wales, UK)
- Swedish School of Economics and B.A. (Helsinki, Finland)
- Swinburne University of Technology Image Bank (Australia)
- Sydney eScholarship Repository (Australia)
South Africa
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- Tartu University, Library (Estonia)
- Teaching and Learning Research Programme Publications (University of London, UK)
- TEORA - TElemark Open Research Archive (Norway)
- Territory Stories - Northern Territory Library (Australia)
- Texas A&M University Libraries Institutional Repository (USA)
- Texas Digital Library (USA)
- TARA - Trinity's Access to Research Archive, Trinity College Dublin (Ireland)
- T-Space at The University of Toronto Libraries (Canada)
- Tsukuba Repository (Tulips-R), University of Tsukuba (Japan)
- Technological Educational Institute of Thessaloniki (Greece)
- Treasury of Wisdom
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