Columbia subject headings:
Building materials--Recycling--History--Congresses.
Mural painting and decoration, Ancient--Congresses.
Mural painting and decoration, Ancient--Conservation and restoration--Congresses.
Mural painting and decoration, Roman--Congresses.
Mural painting and decoration, Roman--Conservation and restoration--Congresses.
Harvard subject headings:
Building materials--Recycling--History--Congresses.
Mural painting and decoration, Ancient--Congresses.
Mural painting and decoration, Ancient--Conservation and restoration--Congresses.
Mural painting and decoration, Roman--Congresses.
Mural painting and decoration, Roman--Conservation and restoration--Congresses.
Princeton subject headings:
Building materials--Recycling--History--Congresses.
Mural painting and decoration, Roman--Congresses.
Mural painting and decoration--Conservation and restoration--Congresses.