Columbia subject headings:
Harvard subject headings:
Business writing--History--Congresses.
Code switching (Linguistics)--Congresses.
Commerce--Slang--History--Congresses.
Commercial correspondence--History--Congresses.
Language and languages--Usage--Congresses.
Merchants--Language--History--Congresses.
Princeton subject headings:
Jargon (Terminology)
Merchants--Language--History.