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• Biodiversity Heritage Library, United States (131)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (1)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (2)
• Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (609)
• Harvard University (5)
• Publishing Network for Geoscientific & Environmental Data (3)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (2)
• University of Michigan (247)