Columbia subject headings:
Harvard subject headings:
Free trade--History--18th century.
Free trade--Latin America--History--18th century.
Free trade--Spain--History--18th century.
Latin America--Commerce--History--18th century.
Latin America--Commerce--Spain--País Vasco--History--18th century.
País Vasco (Spain)--Commerce--Latin America--History--18th century.
País Vasco (Spain)--Commercial policy--History--18th century.
Protectionism--Latin America--History--18th century.
Protectionism--Spain--History--18th century.
Princeton subject headings:
America--Commerce--Spain--País Vasco.
País Vasco (Spain)--Commerce--America.
País Vasco (Spain)--Economic conditions--History.
Spain--Commercial policy--History.