Columbia subject headings:
Harvard subject headings:
Competition, International.
Great Britain--Commercial policy--History--20th century.
North Atlantic Region--Commerce--History--20th century.
North Atlantic Region--Strategic aspects--History--20th century.
Shipping--North Atlantic Region--History--20th century.
Princeton subject headings:
Competition, International.
Great Britain--Commercial policy--History--20th century.
North Atlantic Region--Commerce--History--20th century.
North Atlantic Region--Strategic aspects--History--20th century.
Shipping--North Atlantic Region--History--20th century.