Subject: Canon Law
Author of work: Gregorius IX
Title: Decretales
Subject: Canon Law
Author of work: Gregorius IX
Title: Decretales
Subject: Liturgy
Title: Missale
Subject: Canon Law
Title: Commentary on Clementine constitutions
Subject: Liturgy
Title: Kalendarium
Subject: Liturgy
Title: Graduale
Subject: Liturgy
Title: Missale
Subject: Philosophy
Author of work: Aristoteles
Title: Sophistici elenchi
Subject: Liturgy
Title: Graduale
Subject: Philosophy
Author of work: Aristoteles
Title: Analytica posteriora