Columbia subject headings:
Germany--Emigration and immigration--Social aspects--20th century--Congresses.
Germany--Emigration and immigration--Social aspects--21st century--Congresses.
Harvard subject headings:
Germany--Emigration and immigration--Social aspects--20th century--Congresses.
Germany--Emigration and immigration--Social aspects--21st century--Congresses.
Social integration--Germany--History--20th century--Congresses.
Social integration--Germany--History--21st century--Congresses.
Princeton subject headings:
Germany--Emigration and immigration--Social aspects--20th century--Congresses.
Germany--Emigration and immigration--Social aspects--21st century--Congresses.