Josep M. Millàs i Vallicrosa (Santa Coloma de Farners, 1897-Barcelona, 1970) excelled in the study of the history of science in Muslim Spain and in the study of medieval Hebrew poetry, and he founded a school of Arabists and historians of science who has not stopped exploring Al-Andalus's science with exemplary rigor.

The professional activity included in this collection contains handwritten and typewritten works on Arab science, scientific instruments, medieval Hebrew poetry, history of astronomy and mathematics, and historiography of science.