Columbia subject headings:
Art--Conservation and restoration--Europe.
Harvard subject headings:
Art--Conservation and restoration--Europe.
Riegl, Alois, 1858-1905--Contributions in conservation and restoration.
Riegl, Alois, 1858-1905.
Princeton subject headings:
Art--Historiography.
Riegl, Alois, 1858-1905--Criticism and interpretation.