Columbia subject headings:
Economic history--20th century.
International economic relations--History--20th century.
Protectionism--History--20th century.
World politics--20th century.
Harvard subject headings:
Economic history--20th century
International economic relations--History--20th century
Protectionism--History--20th century.
World politics--20th century
Princeton subject headings:
Economic history--20th century.
International economic relations--History--20th century.
Protectionism--History--20th century.
World politics--20th century.