Columbia subject headings:
Harvard subject headings:
Cave paintings--Conservation and restoration--Congresses.
Cultural property--Protection--Congresses
Petroglyphs--Conservation and restoration--Congresses.
Rock paintings--Conservation and restoration--Congresses.
Princeton subject headings:
Cave paintings--Conservation and restoration--Congresses.
Petroglyphs--Conservation and restoration--Congresses.
Rock paintings--Conservation and restoration--Congresses.