Mellon Collection, Yale University Library MS. 23. 92 folios. Parchment and paper. 303x222mm. 15th Century [c. 1500.] Alphonsus, Rex Castellae. [Tabulae astronomicae, with brief extracts from Canones in tabulas Alphonsi regis, by Johannes (Dank) de Saxonia, and with a few anonymous additions, all in Latin.]