Columbia subject headings:
Latin America--Population.
South America--Population.
Working class--Latin America.
Working class--South America.
Harvard subject headings:
Labor supply--Latin America--History--Congresses.
Labor supply--Latin America--History.
Latin America--Economic conditions--Congresses
Latin America--Emigration and immigration--History.
Latin America--Population--History--Congresses.
Latin America--Population--History.
Princeton subject headings:
Labor--Latin America.
Latin America--Population.