Columbia subject headings:
Harvard subject headings:
Genocide--Germany--History--20th century.
Holocaust, Jewish (1939-1945)
National socialism.
Romani Genocide, 1939-1945
Princeton subject headings:
Atrocities--Germany--History--20th century.
Genocide--Germany--History--20th century.
Germany--Race relations--History--20th century.
Holocaust, Jewish (1939-1945)--Germany.