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Arithmetic--Early works to 1900, Astronomy--Early works to 1800, Astronomy Medieval, Cosmology--Early works to 1800, Time measurements--Early works to 1800 Codices, Diagrams, Illuminations, Treatises, Manuscripts Latin--13th century, Manuscripts Medieval
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Porter, Dot, "Facsimile of LJS 216, Tractatum de spera ... etc." (2015). Schoenberg Institute for Manuscript Studies (SIMS): EBooks. 186.
Collection of three scientific works, nearly contemporary with the life of the author: one work on cosmology and astronomy, one on arithmetic, and one on the division of time according to the movements of the sun and moon. The first work originally followed the second and third, and the beginning of the second work is missing.