Columbia subject headings:
Ireland--Commerce--Scotland--History--18th century.
Scotland--Commerce--Ireland--History--18th century.
Harvard subject headings:
Ireland--Commerce--Scotland--History--18th century.
Scotland--Commerce--Ireland--History--18th century.
Scotland--Economic conditions--18th century--Pictorial works.
Princeton subject headings:
Ireland--Foreign economic relations--Scotland.
Scotland--Foreign economic relations--Ireland.