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