Garland, the Computist, active 11th century: Tractatus de abaco [Latin]
- Manuscripts:
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- MS. Rawl. C. 749 — 12th century
- St John's College MS 17 (Digital facsimile online) — 1110 (?); with additions, s. xiii ex. etc; England (Thorney, Cambs.)
The above references reflect only the current coverage of the online catalogue and may not be comprehensive.