Columbia subject headings:
Harvard subject headings:
Business enterprises--Europe--Congresses.
Business enterprises--Germany--Congresses.
Employment (Economic theory)--Congresses
Labor market--Europe--Congresses.
Labor policy--Europe--Congresses.
Manpower policy--Europe--Congresses.
Unemployment--Europe--Congresses
Princeton subject headings:
Economics--Congresses.
Labor economics--Congresses.
Unemployment--Congresses.