Columbia subject headings:
Harvard subject headings:
France--Politics and government.
Germany--Politics and government.
Great Britain--Politics and government.
Political science
United States--Politics and government.
World War, 1914-1918
Princeton subject headings:
France--Politics and government.
Germany--Politics and government.
Great Britain--Politics and government.
Political science.
United States--Politics and government.
World War, 1914-1918.