Subject: Canon Law
Author of work: Gratianus
Title: Decretum Gratiani
Subject: Canon Law
Title: Constitutiones Clementinae
Subject: Philosophy
Title: Natural philosophy
Subject: Canon Law
Author of work: Gregorius IX
Title: Decretales
Subject: Canon Law
Title: Treatise on canon law
Subject: Philosophy
Title: Comment. on Aristotle's Meteora
Subject: Theology
Author of work: Augustinus
Title: In Genesim contra Manichaeos
Subject: Liturgy
Title: Breviarium
Subject: Liturgy
Title: Missale
Subject: Liturgy
Title: Breviarium