Subject: Astrology
Title: Liber novem judicum
Subject: Canon Law
Title: Commentary on canon law
Subject: Liturgy
Title: Lectionarium
Subject: Civil Law
Author of work: Vacarius
Title: Liber pauperum
Subject: Philosophy
Title: Natural philosophy
Subject: Liturgy
Title: Manuale
Subject: Canon Law
Author of work: Gregorius IX
Title: Decretales
Subject: Canon Law
Title: Treatise on canon law