Columbia subject headings:
Harvard subject headings:
Río de la Plata (Argentina and Uruguay)--Commerce--History.
Río de la Plata (Argentina and Uruguay)--Commerce--Spain--History.
Río de la Plata (Argentina and Uruguay)--Economic conditions.
Shipping--Argentina--Rio de la Plata--History.
Spain--Commerce--Rio de la Plata (Argentina and Uruguay)--History.
Princeton subject headings:
Latin America--Commerce--Spain--History.
Spain--Commerce--Latin America--History.