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• Academic Research Repository at Institute of Developing Economies (1)
• Applied Math and Science Education Repository - Washington - USA (3)
• Archive of European Integration (22)
• Biodiversity Heritage Library, United States (40)
• Brock University, Canada (2)
• Bucknell University Digital Commons - Pensilvania - USA (2)
• Digital Commons @ DU | University of Denver Research (2)
• DigitalCommons@The Texas Medical Center (3)
• DigitalCommons@University of Nebraska - Lincoln (1)
• Digitale Sammlungen - Goethe-Universität Frankfurt am Main (1)
• Doria (National Library of Finland DSpace Services) - National Library of Finland, Finland (1)
• Harvard University (6)
• Iowa Publications Online (IPO) - State Library, State of Iowa (Iowa), United States (3)
• Publishing Network for Geoscientific & Environmental Data (5)
• Universidad Autónoma de Nuevo León, Mexico (1)
• Universidad del Rosario, Colombia (2)
• Université de Lausanne, Switzerland (1)
• University of Connecticut - USA (2)
• University of Michigan (898)
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• USA Library of Congress (1)