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• Biodiversity Heritage Library, United States (8)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (6)
• Brock University, Canada (1)
• CaltechTHESIS (1)
• Cambridge University Engineering Department Publications Database (1)
• Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (1)
• Ministerio de Cultura, Spain (3)
• Portal de Revistas Científicas Complutenses - Espanha (2)
• Publishing Network for Geoscientific & Environmental Data (3)
• Universidad del Rosario, Colombia (1)
• University of Michigan (32)