Columbia subject headings:
Harvard subject headings:
Encomiendas (Latin America)--History.
Indians of South America--Economic conditions.
Labor--Rio de la Plata--History.
Labor--South America--History.
Rio de la Plata Region (Argentina and Uruguay)--Economic conditions.
Río de la Plata (Argentina and Uruguay)--Economic conditions.
Spain--Colonies--America--Administration--History.
Working class--Rio de la Plata Region (Argentina and Uruguay)--History.
Working class--Rio de la Plata--History.
Working class--South America--History.
Princeton subject headings:
Río de la Plata (Viceroyalty)--Economic conditions.
Río de la Plata (Viceroyalty)--History.