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• Aberdeen University (2)
• Academic Research Repository at Institute of Developing Economies (1)
• Archive of European Integration (2)
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• Avian Conservation and Ecology - Eletronic Cientific Hournal - Écologie et conservation des oiseaux: (1)
• Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP) (4)
• Biodiversity Heritage Library, United States (52)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (6)
• Brock University, Canada (3)
• Bucknell University Digital Commons - Pensilvania - USA (4)
• CentAUR: Central Archive University of Reading - UK (2)
• CiencIPCA - Instituto Politécnico do Cávado e do Ave, Portugal (2)
• Consorci de Serveis Universitaris de Catalunya (CSUC), Spain (3)
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• DigitalCommons - The University of Maine Research (3)
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• Doria (National Library of Finland DSpace Services) - National Library of Finland, Finland (3)
• DRUM (Digital Repository at the University of Maryland) (1)
• Ecology and Society (3)
• Instituto Politécnico do Porto, Portugal (1)
• Iowa Publications Online (IPO) - State Library, State of Iowa (Iowa), United States (261)
• Memorial University Research Repository (1)
• Portal de Revistas Científicas Complutenses - Espanha (1)
• Publishing Network for Geoscientific & Environmental Data (128)
• Repositório da Universidade Federal do Espírito Santo (UFES), Brazil (2)
• Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (1)
• RUN (Repositório da Universidade Nova de Lisboa) - FCT (Faculdade de Cienecias e Technologia), Universidade Nova de Lisboa (UNL), Portugal (2)
• Scottish Institute for Research in Economics (SIRE) (SIRE), United Kingdom (1)
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• Universidad del Rosario, Colombia (2)
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