Columbia subject headings:
Harvard subject headings:
Germany--Emigration and immigration
Immigrants--Germany--History--20th century.
Refugee camps--Germany--History--20th century.
Refugees--Germany--History--20th century.
Return migration--Germany--History--20th century.
Social integration--Germany--History--20th century.
Princeton subject headings:
Germany--Emigration and immigration--20th century.
Social integration--Germany.