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• KUPS-Datenbank - Universität zu Köln - Kölner UniversitätsPublikationsServer (1)
• Applied Math and Science Education Repository - Washington - USA (35)
• Aquatic Commons (51)
• Archive of European Integration (23)
• Aston University Research Archive (2)
• Biodiversity Heritage Library, United States (21)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (1)
• Brock University, Canada (4)
• Bucknell University Digital Commons - Pensilvania - USA (1)
• Cambridge University Engineering Department Publications Database (1)
• CentAUR: Central Archive University of Reading - UK (1)
• Comissão Econômica para a América Latina e o Caribe (CEPAL) (1)
• Cornell: DigitalCommons@ILR (1)
• Digital Archives@Colby (1)
• Digital Commons @ DU | University of Denver Research (2)
• Digital Commons @ Winthrop University (1)
• Digital Commons at Florida International University (6)
• DigitalCommons - The University of Maine Research (1)
• DigitalCommons@The Texas Medical Center (4)
• DigitalCommons@University of Nebraska - Lincoln (1)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (1)
• DRUM (Digital Repository at the University of Maryland) (5)
• eResearch Archive - Queensland Department of Agriculture; Fisheries and Forestry (1)
• Harvard University (5)
• Helda - Digital Repository of University of Helsinki (2)
• Iowa Publications Online (IPO) - State Library, State of Iowa (Iowa), United States (1)
• National Center for Biotechnology Information - NCBI (1)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (1)
• Queensland University of Technology - ePrints Archive (5)
• Repositorio de la Universidad de Cuenca (1)
• School of Medicine, Washington University, United States (1)
• University of Michigan (684)
• University of Washington (1)
• USA Library of Congress (121)