Columbia subject headings:
Harvard subject headings:
Archival resources--Austria--Congresses.
Archival resources--Germany--Congresses.
Germany--History--1871-1918--Archival resources--Congresses.
Germany--History--1918-1933--Archival resources--Congresses.
World War, 1914-1918--Germany--Archival resources--Congresses.
Princeton subject headings:
Archival resources--Austria--Congresses.
Archival resources--Germany--Congresses.
Germany--History--1871-1918--Archival resources--Congresses.
Germany--History--1918-1933--Archival resources--Congresses.
World War, 1914-1918--Germany--Archival resources--Congresses.