Columbia subject headings:
Group identity--History--20th century--Congresses.
Sociology, Military--History--20th century--Congresses.
War and society--History--20th century--Congresses.
World War, 1914-1918--Social aspects--Congresses.
Harvard subject headings:
Sociology, Military.
World War, 1914-1918--Social aspects.
Princeton subject headings:
Sociology, Military.
World War, 1914-1918--Social aspects.