Columbia subject headings:
Gregorian chants--500-1400--Manuscripts--France--Aquitaine.
Offertories (Music)--500-1400--Manuscripts--France--Aquitaine.
Prosulas (Music)--500-1400--Manuscripts.
Prosulas (Music)--500-1400.
Harvard subject headings:
Church music--Catholic Church--500-1400.
Church music--France--Aquitaine--500-1400.
Gregorian chants--History and criticism.
Offertories (Music)
Offertories (Music)--History and criticism.
Princeton subject headings:
Catalogs.
Catholic Church--Liturgy--Texts--History and criticism.
Church music--Catholic Church--Manuscripts--Catalogs.
Church music--Catholic Church.
Gregorian chants--History and criticism.
Music--500-1400--Manuscripts--Catalogs.
Music--Manuscripts--France--Aquitaine.
Offertories (Music)
Offertories.
Tropers.