Columbia subject headings:
Harvard subject headings:
Amritsar Massacre, Amritsar, India, 1919.
Anti-imperialist movements--Great Britain--History--20th century.
Bloody Sunday, Dublin, Ireland, 1920.
Decolonization--Colonies--Great Britain--History--20th century.
Great Britain--Colonies--20th century.
Princeton subject headings:
British--India--History--20th century.
British--Ireland--History--20th century.
Great Britain--Colonies--20th century.