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• AMS Tesi di Laurea - Alm@DL - Università di Bologna (1)
• Applied Math and Science Education Repository - Washington - USA (5)
• Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP) (1)
• Biodiversity Heritage Library, United States (15)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (33)
• Boston University Digital Common (7)
• Brock University, Canada (1)
• Cambridge University Engineering Department Publications Database (3)
• CentAUR: Central Archive University of Reading - UK (2)
• Center for Jewish History Digital Collections (27)
• Chapman University Digital Commons - CA - USA (2)
• Chinese Academy of Sciences Institutional Repositories Grid Portal (2)
• CORA - Cork Open Research Archive - University College Cork - Ireland (1)
• Deakin Research Online - Australia (2)
• Digital Archives@Colby (1)
• DRUM (Digital Repository at the University of Maryland) (1)
• Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (1)
• Greenwich Academic Literature Archive - UK (1)
• Harvard University (87)
• Portal de Revistas Científicas Complutenses - Espanha (1)
• Publishing Network for Geoscientific & Environmental Data (1)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (2)
• Queensland University of Technology - ePrints Archive (19)
• Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (3)
• South Carolina State Documents Depository (2)
• Universidad del Rosario, Colombia (4)
• Universidad Politécnica de Madrid (2)
• Universitätsbibliothek Kassel, Universität Kassel, Germany (1)
• University of Michigan (766)
• USA Library of Congress (2)