Columbia subject headings:
Harvard subject headings:
Warships--France--History--20th century.
World War, 1914-1918--Campaigns--Atlantic Ocean
World War, 1914-1918--Naval operations, French.
Princeton subject headings:
World War, 1914-1918--Campaigns--Atlantic Ocean.
World War, 1914-1918--Naval operations, French.
World War, 1914-1918--Naval operations, German.
World War, 1914-1918--Naval operations--Submarine.