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• Acceda, el repositorio institucional de la Universidad de Las Palmas de Gran Canaria. España (1)
• Archive of European Integration (1)
• 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. (9)
• Biodiversity Heritage Library, United States (33)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (5)
• Brock University, Canada (11)
• Comissão Econômica para a América Latina e o Caribe (CEPAL) (1)
• Consorci de Serveis Universitaris de Catalunya (CSUC), Spain (8)
• CUNY Academic Works (52)
• Digital Commons @ DU | University of Denver Research (1)
• DigitalCommons@University of Nebraska - Lincoln (2)
• Doria (National Library of Finland DSpace Services) - National Library of Finland, Finland (14)
• Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (18)
• Harvard University (272)
• Iowa Publications Online (IPO) - State Library, State of Iowa (Iowa), United States (11)
• Martin Luther Universitat Halle Wittenberg, Germany (1)
• Memoria Académica - FaHCE, UNLP - Argentina (36)
• Ministerio de Cultura, Spain (2)
• Portal de Revistas Científicas Complutenses - Espanha (2)
• Publishing Network for Geoscientific & Environmental Data (1)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (1)
• ReCiL - Repositório Científico Lusófona - Grupo Lusófona, Portugal (1)
• RUN (Repositório da Universidade Nova de Lisboa) - FCT (Faculdade de Cienecias e Technologia), Universidade Nova de Lisboa (UNL), Portugal (4)
• School of Medicine, Washington University, United States (3)
• Scielo Saúde Pública - SP (3)
• Universidad Autónoma de Nuevo León, Mexico (1)
• Universidad de Alicante (2)
• Universidad del Rosario, Colombia (2)
• Universidad Politécnica de Madrid (2)
• Universidade do Minho (1)
• Université de Lausanne, Switzerland (25)
• Université de Montréal, Canada (1)
• University of Michigan (399)
• University of Queensland eSpace - Australia (5)
• USA Library of Congress (67)