Columbia subject headings:
Harvard subject headings:
Birkenau (Concentration camp)
Romanies--Germany--History--20th century.
Romanies--Nazi persecution--Germany
World War, 1939-1945--Atrocities.
Princeton subject headings:
Romanies--Germany--History--20th century.
Romanies--Nazi persecution--Germany.
World War, 1939-1945--Atrocities.