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• Aquatic Commons (1)
• ArchiMeD - Elektronische Publikationen der Universität Mainz - Alemanha (66)
• Archive of European Integration (1)
• Archivo Digital para la Docencia y la Investigación - Repositorio Institucional de la Universidad del País Vasco (1)
• Biblioteca Digital da Câmara dos Deputados (1)
• Biblioteca Digital Loyola - Universidad de Deusto (3)
• Biodiversity Heritage Library, United States (9)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (57)
• Cambridge University Engineering Department Publications Database (1)
• Center for Jewish History Digital Collections (3)
• Digital Peer Publishing (1)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (427)
• Dokumentenserver der Akademie der Wissenschaften zu Göttingen (2)
• Duke University (1)
• Fachlicher Dokumentenserver Paedagogik/Erziehungswissenschaften (1)
• Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (1)
• Memoria Académica - FaHCE, UNLP - Argentina (3)
• National Center for Biotechnology Information - NCBI (3)
• Portal de Revistas Científicas Complutenses - Espanha (1)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (3)
• Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (1)
• Universitätsbibliothek Kassel, Universität Kassel, Germany (5)
• University of Innsbruck Digital Library - Austria (1)
• University of Michigan (401)