Columbia subject headings:
Spain--Colonies--America--Administration--History.
Spain--Economic conditions.
Spain--History--House of Austria, 1516-1700.
Harvard subject headings:
Spain--Colonies--America--Administration--History.
Spain--Colonies--America--Commerce.
Spain--Economic conditions.
Spain--Foreign relations--1516-1700.
Spain--History--House of Austria, 1516-1700.
Princeton subject headings:
Spain--Colonies--America--Administration--History.
Spain--Economic conditions.
Spain--History--House of Austria, 1516-1700.