Gerardus, de Solo, 1250–1360: Directorium siue introductorium [Latin]
- Manuscripts:
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- MS. Canon. Misc. 566 (Selected pages online) — 1443–1444; Italian, Venice (?)
- MS. Lyell empt. 2 (Digital facsimile online) — 15th century; Austrian
The above references reflect only the current coverage of the online catalogue and may not be comprehensive.