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• Biodiversity Heritage Library, United States (3)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (91)
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• Dokumentenserver der Akademie der Wissenschaften zu Göttingen (2)
• Fachlicher Dokumentenserver Paedagogik/Erziehungswissenschaften (14)
• Institutional Repository of Leibniz University Hannover (2)
• Instituto Gulbenkian de Ciência (1)
• Plymouth Marine Science Electronic Archive (PlyMSEA) (1)
• Portal de Revistas Científicas Complutenses - Espanha (3)
• Publishing Network for Geoscientific & Environmental Data (33)
• Repositório Institucional da Universidade de Aveiro - Portugal (1)
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• University of Michigan (287)