Columbia subject headings:
Contraband of war.
Freedom of the seas.
Maritime law--Great Britain.
World War, 1914-1918--Blockades.
Harvard subject headings:
Contraband of war.
Freedom of the seas.
Maritime law--Great Britain.
World War, 1914-1918--Blockades
Princeton subject headings:
Contraband of war.
Freedom of the seas.
Maritime law--Great Britain.
World War, 1914-1918--Blockades.