Columbia subject headings:
Industrial relations--Europe--Congresses.
Industrial relations--United States--Congresses.
Work environment--Europe--International cooperation--Congresses.
Work environment--United States--International cooperation--Congresses.
Harvard subject headings:
Industrial relations--Europe--Congresses
Industrial relations--United States--Congresses
Work environment--Europe--International cooperation--Congresses.
Work environment--United States--International cooperation--Congresses.
Princeton subject headings:
Industrial relations--Europe--Congresses.
Industrial relations--United States--Congresses.
Work environment--Europe--International cooperation--Congresses.
Work environment--United States--International cooperation--Congresses.