Columbia subject headings:
Harvard subject headings:
Abercromby, Ralph, Sir, 1734-1801.
British--West Indies--History--18th century.
San Juan (P.R.)--History--Siege, 1797.
West Indies--History--18th century.
Princeton subject headings:
Caribbean Area--Foreign relations--Europe--History--18th century.
Caribbean Area--History--18th century.
Europe--Foreign relations--Caribbean Area--History--18th century.
Great Britain--Foreign relations--Caribbean Area--History--18th century.
Puerto Rico--Foreign relations--Europe--History--18th century.
Puerto Rico--Foreign relations--Great Britain--History--18th century.
Puerto Rico--History--18th century.