Columbia subject headings:
Germany, Northern--History--20th century.
War and society--Germany.
World War, 1914-1918--Germany.
World War, 1914-1918--Social aspects--Germany.
Harvard subject headings:
Germany, Northern--History--20th century--Congresses.
War and society--Germany--Congresses.
War, Declaration of--Germany--Congresses.
World War, 1914-1918--Germany--Congresses.
World War, 1914-1918--Social aspects--Germany--Congresses.
Princeton subject headings:
Germany, Northern--History--20th century--Congresses.
War and society--Germany--Congresses.
War, Declaration of--Germany--Congresses.
World War, 1914-1918--Germany--Congresses.
World War, 1914-1918--Social aspects--Germany--Congresses.