Columbia subject headings:
Europe--History--1871-1918.
Europe--History--1918-1945.
Revolutions--Europe--History--20th century.
World War, 1914-1918--Influence.
World War, 1914-1918.
Harvard subject headings:
Europe--History--1871-1918.
Europe--History--1918-1945.
Revolutions--Europe--History--20th century.
World War, 1914-1918--Influence
World War, 1914-1918.
Princeton subject headings:
Europe--History--1871-1918.
Europe--History--1918-1945.
Revolutions--Europe--History--20th century.
World War, 1914-1918--Influence.
World War, 1914-1918.