Columbia subject headings:
World War, 1914-1918--Campaigns--North Sea.
World War, 1914-1918--Naval operations, British.
Harvard subject headings:
World War, 1914-1918--Campaigns--North Sea
World War, 1914-1918--Naval operations, British
Princeton subject headings:
World War, 1914-1918--Campaigns--North Sea.
World War, 1914-1918--Naval operations, British.