Columbia subject headings:
Harvard subject headings:
Helgoland Bight (Germany)--History--20th century.
North Sea Coast (Germany)--History--20th century.
World War, 1939-1945--Germany--Helgoland Bight.
World War, 1939-1945--Germany--North Sea Coast.
Princeton subject headings:
Helgoland Bight (Germany)--History--20th century.
North Sea Coast (Germany)--History--20th century.
World War, 1939-1945--Germany--Helgoland Bight.
World War, 1939-1945--Germany--North Sea Coast.