Columbia subject headings:
Harvard subject headings:
Sonnenburg (Poland : Concentration camp)
World War, 1939-1945--Concentration camps--Poland.
World War, 1939-1945--Prisoners and prisons, German.
Princeton subject headings:
Sonnenburg (Poland : Concentration camp).
World War, 1939-1945--Atrocities.
World War, 1939-1945--Prisoners and prisons, German.