al-Risālah al-Sharafīyah fī al-nisab al-taʾlīfīyah / ʻAbd al-Muʾmin ibn Yūsuf al-Urmawī.Urmawī, ʻAbd al-Muʼmin ibn Yūsuf, approximately 1216-1294.[after 1268]The colophon, dated A.H. 666 (A.D. 1268), is presumably that of the original from which this manuscript was copied, probably not many years afterwards.Treatise on music.Calligraphic naskhī.Copious diagrams.From the library of Silvestre de Sacy (Catalogue, no. 88, wrongly ascribed to al-Fārābī). Presented to Yale by Edward Elbridge Salisbury in 1870.Islamic binding, in brown.Some errors in contemporary foliation.text