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so:source http://www.oldandsold.com/articles11/italy-35.shtml
qkg:contextText Vellum folded as letter describing Leonardo da Vinci as Borgia's Military Engineer, bears the seal of Cesare as Duke and the seal of Alessandro Borgia on the back (July 1502). (The vellum was recently made available to the public by the Duchess Josephine Melzi d'Eril Barbo) Source: http://www.oldandsold.com/articles11/italy-35.shtml (en)
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