Fr. Rogeri Bacon Opera Quaedam Hactenus Inedita: Vol. 1. Containing 1. Opus Tertium. 2. Opus Minus. 3. Compendium Philosophiae (Paperback) (ISBN-13: 9781021204202)

A collection of previously unpublished works by 13th century philosopher Roger Bacon, including his Opus Tertium, Opus Minus, and Compendium Philosophiae.

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