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• Biodiversity Heritage Library, United States (4)
• CentAUR: Central Archive University of Reading - UK (5)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (2)
• Duke University (1)
• Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (2)
• Harvard University (8)
• Portal de Revistas Científicas Complutenses - Espanha (6)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (6)
• Queensland University of Technology - ePrints Archive (1)
• Repositorio Institucional de la Universidad Nacional Agraria (1)
• Universidad del Rosario, Colombia (2)
• University of Michigan (246)
• Worcester Research and Publications - Worcester Research and Publications - UK (1)