Columbia subject headings:
Internment camps--Europe.
National socialism.
Nazi concentration camps--Europe.
World War, 1939-1945--Concentration camps.
Harvard subject headings:
Concentration camps--Europe.
Concentration camps--History--20th century.
National socialism.
World War, 1939-1945--Concentration camps.
Princeton subject headings:
National socialism.
Nazi concentration camps--Europe.
World War, 1939-1945--Concentration camps.