Subject: Canon Law
Author of work: Gregorius IX
Title: Decretales
Subject: Liturgy
Title: Missale
Subject: Liturgy
Title: Pontificale
Subject: Liturgy
Title: Missale
Subject: Liturgy
Title: Homily on St Mary Magdalen (?)
Subject: Liturgy
Title: Graduale
Subject: Philosophy
Title: Commentary on Aristotle, Ethica (?)
Subject: Liturgy
Title: Graduale
Subject: Liturgy
Title: Antiphonale
Subject: Liturgy
Title: Antiphonale (?)