Columbia subject headings:
Harvard subject headings:
Communication--Cross-cultural studies--Congresses.
Communication--History--Congresses.
Letter writing--Cross-cultural studies--Congresses.
Letter writing--History--Congresses.
Salutations--Cross-cultural studies--Congresses.
Princeton subject headings:
Communication--Cross-cultural studies--Congresses.
Communication--History--Congresses.
Letter writing--Cross-cultural studies--Congresses.
Letter writing--History--Congresses.
Salutations--Cross-cultural studies--Congresses.