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• Academic Research Repository at Institute of Developing Economies (1)
• Applied Math and Science Education Repository - Washington - USA (1)
• Aquatic Commons (9)
• Archive of European Integration (25)
• Avian Conservation and Ecology - Eletronic Cientific Hournal - Écologie et conservation des oiseaux: (1)
• Biodiversity Heritage Library, United States (13)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (3)
• Brock University, Canada (28)
• Bucknell University Digital Commons - Pensilvania - USA (3)
• CentAUR: Central Archive University of Reading - UK (4)
• Coffee Science - Universidade Federal de Lavras (1)
• Comissão Econômica para a América Latina e o Caribe (CEPAL) (2)
• Dalarna University College Electronic Archive (1)
• Digital Commons @ DU | University of Denver Research (2)
• DigitalCommons@The Texas Medical Center (5)
• DigitalCommons@University of Nebraska - Lincoln (1)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (3)
• DRUM (Digital Repository at the University of Maryland) (1)
• Duke University (5)
• Harvard University (11)
• Plymouth Marine Science Electronic Archive (PlyMSEA) (1)
• Publishing Network for Geoscientific & Environmental Data (3)
• QSpace: Queen's University - Canada (1)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (10)
• Queensland University of Technology - ePrints Archive (4)
• Repositório Digital da UNIVERSIDADE DA MADEIRA - Portugal (1)
• School of Medicine, Washington University, United States (1)
• South Carolina State Documents Depository (1)
• Universidad Autónoma de Nuevo León, Mexico (4)
• Universidad del Rosario, Colombia (1)
• Universidad Politécnica de Madrid (1)
• University of Connecticut - USA (2)
• University of Michigan (833)
• USA Library of Congress (4)
• WestminsterResearch - UK (1)