Columbia subject headings:
Labor--Congresses.
Work--Philosophy--Congresses.
Work--Social aspects--Congresses.
Harvard subject headings:
Comparative linguistics--History--Congresses.
Labor--Terminology--Congresses.
Labor--Terminology--History--Congresses.
Semantics, Historical--Congresses.
Princeton subject headings:
Comparative linguistics--History--Congresses.
Labor--Terminology--Congresses.
Labor--Terminology--History--Congresses.
Semantics, Historical--Congresses.