Columbia subject headings:
Harvard subject headings:
Auschwitz (Concentration camp)
Concentration camps--Poland.
Romanies--Nazi persecution--Poland.
World War, 1939-1945--Concentration camps--Poland.
Princeton subject headings:
Auschwitz (Concentration camp)
Nazi concentration camps--Poland.
Romani Genocide, 1939-1945--Poland.
World War, 1939-1945--Concentration camps--Poland.