Columbia subject headings:
Peace.
World War, 1914-1918--Influence.
World War, 1939-1945--Causes.
World politics--1919-1932.
World politics--1933-1945.
Harvard subject headings:
Peace
World War, 1914-1918--Influence
World War, 1939-1945--Causes.
World politics--1919-1932
World politics--1933-1945
Princeton subject headings:
Peace.
World War, 1914-1918--Influence.
World War, 1939-1945--Causes.
World politics--1919-1932.
World politics--1933-1945.