Columbia subject headings:
Harvard subject headings:
South America--Economic conditions--20th century.
South America--Economic policy.
South America--Politics and government--20th century.
South America--Social conditions--20th century.
Southern Cone of South America--Economic conditions.
Southern Cone of South America--Social conditions.
Princeton subject headings:
South America--Economic conditions--20th century.
South America--Economic policy.
South America--Politics and government--20th century.
South America--Social conditions--20th century.