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File:Banco Nacional Ultramarino, Angola (1921) - 2.50 Escudos, Front (Proof).jpg - Wikimedia Commons
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File:Exemplos de notas (em escudos) emitidas pelo Banco Nacional Ultramarino.jpg - Wikimedia Commons
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Amazon.it: The Portuguese African Paper Money of the Banco Nacional Ultramarino - Pope, Laurence, Matos, Parcdio Campos E., Pattison, Andrew - Libri
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