Subject: Canon Law
Title: Commentary on Decretals
Subject: Philosophy
Title: Scholastic philosophy
Subject: Liturgy
Title: Missale
Subject: Canon Law
Author of work: Gregorius IX
Title: Decretales
Subject: Civil Law
Title: Commentary on civil law
Subject: Liturgy
Title: Antiphonale
Subject: Theology
Title: Scholastic theology
Subject: Astrology
Title: Liber novem judicum