books.google.frhttps://books.google.fr/books/about/Fr_Rogeri_Bacon_Opera_qu%C3%A6dam_hactenus_i.html?hl=fr&id=wMUKAAAAYAAJ&utm_source=gb-gplus-shareFr. Rogeri Bacon Opera quædam hactenus inedita. Vol. I. containing I.--Opus tertium. II.--Opus minus. III.--Compendium philosophiæ
