Columbia subject headings:
Harvard subject headings:
Christianity and politics--Germany--History--20th century--Congresses.
Church and state--Germany--History--20th century--Congresses.
Germany--History--Revolution, 1918--Congresses.
Hoffmann, Adolph, 1858-1930--Congresses.
Princeton subject headings:
Church and state--Germany--History--Congresses.
Germany--Politics and government--1871-1933--Congresses.
Hoffmann, Adolph, 1858-1930--Congresses.
Socialists--Germany--Biography--Congresses.