Columbia subject headings:
Harvard subject headings:
Nazi concentration camp inmates--Germany--Correspondence
Nazi concentration camps--Germany--History
World War, 1939-1945--Concentration camps--Germany
World War, 1939-1945--Prisoners and prisons, German
Princeton subject headings:
Nazi concentration camp inmates--Germany--History--20th century.
World War, 1939-1945--Concentration camps--Germany.
World War, 1939-1945--Prisoners and prisons, German.