Columbia subject headings:
Catholic Church--Germany--History.
Church work with youth--Germany--Catholic Church--History.
Youth--Germany--History.
Harvard subject headings:
Catholic Church--Germany--History--20th century.
Church work with youth--Catholic Church--History--20th century.
Church work with youth--Germany--History--20th century.
Youth--Religious life--Germany--History--20th century.
Princeton subject headings:
Germany--Church history--20th century.
Youth--Germany--History--20th century.