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• AMS Tesi di Laurea - Alm@DL - Università di Bologna (1)
• Applied Math and Science Education Repository - Washington - USA (12)
• Archivo Digital para la Docencia y la Investigación - Repositorio Institucional de la Universidad del País Vasco (1)
• Avian Conservation and Ecology - Eletronic Cientific Hournal - Écologie et conservation des oiseaux: (4)
• Biodiversity Heritage Library, United States (2)
• BORIS: Bern Open Repository and Information System - Berna - Suiça (5)
• Boston University Digital Common (1)
• CaltechTHESIS (1)
• CentAUR: Central Archive University of Reading - UK (4)
• Digital Commons - Michigan Tech (4)
• Digital Commons - Montana Tech (10)
• Digital Commons @ DU | University of Denver Research (1)
• Digital Commons at Florida International University (3)
• DigitalCommons@University of Nebraska - Lincoln (4)
• DRUM (Digital Repository at the University of Maryland) (1)
• Ecology and Society (1)
• Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (1)
• Publishing Network for Geoscientific & Environmental Data (8)
• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (2)
• Queensland University of Technology - ePrints Archive (3)
• Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (1)
• Universidad del Rosario, Colombia (2)
• University of Michigan (219)
• University of Queensland eSpace - Australia (1)
• University of Washington (2)