Columbia subject headings:
Library materials--Conservation and restoration--Congresses.
Newspapers--Conservation and restoration--Congresses.
Periodicals--Conservation and restoration--Congresses.
Harvard subject headings:
Library materials--Conservation and restoration--Congresses.
Library materials--Conservation and restoration--Periodicals--Congresses.
Library materials--Conservation and restoration--Periodicals.
Princeton subject headings:
Library materials--Conservation and restoration--Congresses.
Library materials--Conservation and restoration--Periodicals--Congresses.
Periodicals.