Columbia subject headings:
Bourbon, House of.
Duchies--Italy--History--18th century.
France--Foreign economic relations.
Great Britain--Foreign economic relations.
Spain--Foreign economic relations.
Harvard subject headings:
Bourbon, House of.
Duchies--Italy--History--18th century.
France--Foreign economic relations.
Great Britain--Foreign economic relations.
Spain--Foreign economic relations.
Princeton subject headings: