Columbia subject headings:
Catholic Church--Germany--Trier--Hymns--History and criticism.
Catholic Church. Diocese of Trier (Germany)--History.
Hymns, German--Germany--Trier--History and criticism.
Harvard subject headings:
Catholic Church--Germany--Trier Region--Liturgy--History.
Catholic Church--Hymns--History and criticism.
Catholic Church. Diocese of Trier (Germany)
Hymns, German--History and criticism.
Trier Region (Germany)--Church history.
Princeton subject headings:
Catholic Church--Germany--Trier Region--Liturgy--History.
Catholic Church--Hymns--History and criticism.
Catholic Church. Diocese of Trier (Germany)
Hymns, German--History and criticism.
Trier Region (Germany)--Church history.