Columbia subject headings:
Antiphonaries.
Antiphons (Music)
Catholic Church--Liturgy.
Graduals (Liturgical books)
Gregorian chants.
Illumination of books and manuscripts, Italian--Italy--Piacenza.
Illumination of books and manuscripts, Medieval--Italy--Piacenza.
Liber magistri.
Harvard subject headings:
Catholic Church--Italy--Piacenza--Liturgy--Texts--Manuscripts.
Catholic Church. Liber magistri (Ms. Liber magistri)
Gregorian chants.
Liber magistri.
Music--Manuscripts--Facsimiles
Music--Manuscripts--Italy--Piacenza.
Sacred vocal music--Italy--Piacenza--500-1400.
Princeton subject headings: