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John Philoponus De usu astrolabii Florence Plut. . en John Philoponus On the Use and Construction of the Astrolabe in ms Florence Biblioteca Medicea Laurenziana Plut fol Johannes Philoponos De usu astrolabii eiusque constructione in der Handschrift Florenz Biblioteca Medicea Laurenziana Plut fol copy John Philoponus other versions