Columbia subject headings:
Catholic Church. Diocese of Trier (Germany)--History.
Christian socialism--Germany--Trier--History.
Christian sociology--Catholic Church--Germany--Trier--History.
Katholische Arbeitnehmer-Bewegung--Germany--Trier--History.
Working class--Germany--Trier--History.
Harvard subject headings:
Catholic Church. Diocese of Trier (Germany)
Catholic labor unions--Germany--Trier--History.
Catholics--Germany--Trier.
Katholische Arbeitnehmer-Bewegung--History.
Labor--Germany--Trier--Religious aspects--Christianity--History.
Labor--Religious aspects--Christianity--Germany--Trier--History.
Princeton subject headings: