Columbia subject headings:
Building stones--Biodegradation--Congresses.
Building stones--Conservation and restoration--Congresses.
Mural painting and decoration--Conservation and restoration--Congresses.
Mural painting and decoration--Deterioration--Congresses.
Stone buildings--Conservation and restoration--Congresses.
Harvard subject headings:
Building stones--Biodegradation--Congresses.
Building stones--Conservation and restoration--Congresses.
Mural painting and decoration--Conservation and restoration--Congresses.
Mural painting and decoration--Deterioration--Congresses.
Stone buildings--Conservation and restoration--Congresses.
Princeton subject headings:
Building stones--Conservation and restoration--Congresses.
Building stones--Deterioration--Congresses.
Stone buildings--Conservation and restoration--Congresses.