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Houghton Typ .. Philosophia . en Woodcut of Philosophia signed with the monogram of Albrecht Drer From Qvatvor libri amorvm secvndvm qvatvor latera Germanie feliciter incipivnt by Konrad Celtis Conrad Celtes lib harvard edu Typ Houghton Library Harvard University lib harvard edu Typ Houghton Library Harvard Universitybr