Columbia subject headings:
Harvard subject headings:
Ubena (Ship)
World War, 1939-1945--Evacuation of civilians--Germany--Prussia.
World War, 1939-1945--Naval operations, German.
Princeton subject headings:
Ubena (Ship)
World War, 1939-1945--Evacuation of civilians--Prussia (Germany).
World War, 1939-1945--Naval operations, German.