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• Applied Math and Science Education Repository - Washington - USA (25)
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• Cambridge University Engineering Department Publications Database (1)
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• Center for Jewish History Digital Collections (1)
• Digital Commons - Montana Tech (1)
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• Harvard University (15)
• Plymouth Marine Science Electronic Archive (PlyMSEA) (1)
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• QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (3)
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• University of Michigan (35)