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• AMS Tesi di Dottorato - Alm@DL - Università di Bologna (1)
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• Avian Conservation and Ecology - Eletronic Cientific Hournal - Écologie et conservation des oiseaux: (1)
• Biblioteca Digital | Sistema Integrado de Documentación | UNCuyo - UNCUYO. UNIVERSIDAD NACIONAL DE CUYO. (1)
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• Biblioteca Digital de Teses e Dissertações Eletrônicas da UERJ (1)
• Biodiversity Heritage Library, United States (26)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (8)
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• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (3)
• DRUM (Digital Repository at the University of Maryland) (1)
• Fachlicher Dokumentenserver Paedagogik/Erziehungswissenschaften (4)
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• Oral Archive of California Institute of Technology (1)
• Portal de Revistas Científicas Complutenses - Espanha (6)
• Publishing Network for Geoscientific & Environmental Data (3)
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