Columbia subject headings:
Harvard subject headings:
Oral tradition--Africa--Congresses.
Semiotics--Africa--Congresses.
Writing--Africa--History--Congresses.
Written communication--Africa--Congresses.
Princeton subject headings:
Oral tradition--Africa--Congresses.
Semiotics--Africa--Congresses.
Writing--Africa--History--Congresses.
Written communication--Africa--Congresses.