Columbia subject headings:
Germany (West)--Economic conditions--Congresses.
Germany (West)--Emigration and immigration--Congresses.
Germany (West)--Social conditions--Congresses.
Harvard subject headings:
Germany (West)--Economic conditions--Congresses.
Germany (West)--Social conditions--Congresses.
Germany--Ethnic relations--Congresses.
Immigrants--Germany (West)--Congresses.
Immigrants--Germany--Congresses.
Princeton subject headings: