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• Academic Archive On-line (Karlstad University; Sweden) (2)
• Adam Mickiewicz University Repository (1)
• Biodiversity Heritage Library, United States (1)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (140)
• CentAUR: Central Archive University of Reading - UK (3)
• Center for Jewish History Digital Collections (1)
• Digital Peer Publishing (3)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (250)
• Dokumentenserver der Akademie der Wissenschaften zu Göttingen (20)
• Fachlicher Dokumentenserver Paedagogik/Erziehungswissenschaften (2)
• Harvard University (1)
• Helda - Digital Repository of University of Helsinki (2)
• Martin Luther Universitat Halle Wittenberg, Germany (1)
• Portal de Revistas Científicas Complutenses - Espanha (4)
• Publishing Network for Geoscientific & Environmental Data (2)
• Universidad Politécnica de Madrid (1)
• Universitätsbibliothek Kassel, Universität Kassel, Germany (21)
• University of Michigan (541)