Columbia subject headings:
Archival materials--Conservation and restoration--Africa, Southern--Congresses.
Books--Conservation and restoration--Africa, Southern--Congresses.
Library materials--Conservation and restoration--Africa, Southern--Congresses.
Harvard subject headings:
Archival materials--Conservation and restoration--Africa, Southern--Congresses.
Archival materials--Conservation and restoration--Congresses.
Books--Conservation and restoration--Africa, Southern--Congresses.
Library materials--Conservation and restoration--Africa, Southern--Congresses.
Library materials--Conservation and restoration--Congresses.
Princeton subject headings: