Subject: Canon Law
Author of work: Guido de Baysio
Title: In Sextum librum decretalium
Subject: Computus
Title: Computus
Subject: Canon Law
Title: Treatise on canon law
Subject: Medicine
Title: Medicine
Subject: Theology
Title: Scholastic theology
Subject: Canon Law
Author of work: Gratianus
Title: Decretum Gratiani
Subject: Liturgy
Title: Graduale