Columbia subject headings:
Foreign workers--Germany (West)--Congresses.
Germany (West)--Emigration and immigration--Congresses.
Minorities--Germany (West)--Congresses.
Harvard subject headings:
Foreign workers--Germany (West)--Congresses.
Germany (West)--Emigration and immigration--Congresses.
Minorities--Germany (West)--Congresses.
Princeton subject headings:
Foreign workers--Germany (West)--Congresses.
Immigrants--Germany (West)--Congresses.
Minorities--Germany (West)--Congresses.