Columbia subject headings:
Genocide--Europe--History--20th century.
Population transfers--History--20th century.
Harvard subject headings:
Europe--Ethnic relations.
Forced migration--Europe--History--20th century.
Genocide--Europe--History--20th century.
Population transfers--Europe--History--20th century.
Population transfers--History--20th century.
Princeton subject headings:
Forced migration--Europe--History--20th century.
Population transfers--Europe--History--20th century.