Columbia subject headings:
Consuls--Spain.
Diplomatic and consular service, Spanish--History.
Spain--Commerce--History.
Spain--Foreign economic relations.
Harvard subject headings:
Diplomatic and consular service, Spanish--Europe--History.
Europe--Foreign economic relations--Spain--History.
Spain--Foreign economic relations--Europe--History.
Princeton subject headings:
Diplomatic and consular service, Spanish--Europe--History.
Europe--Foreigneconomic relations--Spain--History.
Spain--Foreign economic relations--Europe--History.