Columbia subject headings:
Europe--Politics and government--19th and 20th century--Bibliography.
International law--Bibliography.
International relations--Bibliography.
World War, 1914-1918--Bibliography.
Harvard subject headings:
Europe--Politics and government--1789-1900--Bibliography.
Europe--Politics and government--20th century--Bibliography.
International relations--Bibliography
World War, 1914-1918--Bibliography
Princeton subject headings:
Europe--Politics and government--1789-1900--Bibliography.
Europe--Politics and government--20th century--Bibliography.
International relations--Bibliography.
World War, 1914-1918--Bibliography.