1. Harley MS 6046, ff 222r-249r Reference (shelfmark): Harley MS 6046, ff 222r-249r Title: Commentary on Johannes de Sacro Bosco, Tractatus de sphera Scope & Content: Commentary on Johannes de Sacro Bosco, Tractatus de sphera, entitled In Spheram Iohannis de Sacro Bosco commentarius, incipit: 'Compendium quodam est...' Collection Area: Western Manuscripts Languages: Latin Date Range: 1605-1606 Extent: 29 folios.