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Houghton Typ .. Opticorvm libri sex . en Illustration from Francisci Agvilonii Societate Iesv Opticorvm libri sex Franois de Aguiln Engraving by Theodoor Galle after design by Rubens lib harvard edu Typ Houghton Library Harvard University lib harvard edu Typ Houghton Library Harvard Universitybr institution Houghton