Columbia subject headings:
Communication--Congresses.
Extemporaneous speaking--Congresses.
Language and languages--Congresses.
Thought and thinking--Congresses.
Harvard subject headings:
Communication--Congresses
Extemporaneous speaking--Congresses.
Language and languages--Congresses
Thought and thinking--Congresses
Princeton subject headings:
Communication--Congresses.
Extemporaneous speaking--Congresses.
Language and languages--Congresses.
Thought and thinking--Congresses.