Columbia subject headings:
Business networks--Spain--History--To 1500.
Social networks--Spain--History--To 1500.
Spain--History--711-1516.
Harvard subject headings:
Business networks--Spain--History--To 1500.
Social networks--Spain--History--To 1500.
Spain--History--711-1516.
Princeton subject headings:
Business networks--Spain--History--To 1500.
Social networks--Spain--History--To 1500.
Spain--History--711-1516.