Columbia subject headings:
Crucifixum in carne.
Music--Germany--Erfurt--500-1400--History and criticism.
Organa.
Harvard subject headings:
Church music--Germany--Erfurt.
Crucifixum in carne.
Easter music--History and criticism.
Music--Germany--Erfurt--500-1400--History and criticism.
Organa--History and criticism
Princeton subject headings:
Crucifixum in carne.
Music--Germany--Erfurt--500-1400--History and criticism.
Organa--History and criticism.