Columbia subject headings:
Harvard subject headings:
Europe--Relations--Germany--Congresses.
Europe--Relations--Russia--Congresses.
Germany--Relations--Europe--Congresses.
Germany--Relations--Russia--Congresses.
Russia--Relations--Europe--Congresses.
Russia--Relations--Germany--Congresses.
World War, 1914-1918--Diplomatic history--Congresses.
World War, 1914-1918--Germany--Congresses.
World War, 1914-1918--Russia--Congresses.
World War, 1914-1918--Social aspects--Congresses.
Princeton subject headings:
Europe--Relations--Germany--Congresses.
Europe--Relations--Russia--Congresses.
Germany--Relations--Europe--Congresses.
Germany--Relations--Russia--Congresses.
Russia--Relations--Europe--Congresses.
Russia--Relations--Germany--Congresses.
World War, 1914-1918--Diplomatic history--Congresses.
World War, 1914-1918--Germany--Congresses.
World War, 1914-1918--Russia--Congresses.
World War, 1914-1918--Social aspects--Congresses.