Columbia subject headings:
Harvard subject headings:
Gems--Russia (Federation)--Saint Petersburg--Catalogs.
Gosudarstvennyĭ Ėrmitazh (Russia)--Catalogs.
Orléans, Louis Philippe Joseph, duc d', 1747-1793--Art collections--Catalogs.
Princeton subject headings:
Gems--Russia (Federation)--Saint Petersburg--Exhibitions.
Gosudarstvennyĭ Ėrmitazh (Russia)--Exhibitions.
Orléans, Louis Philippe Joseph, duc d', 1747-1793--Art collections--Exhibitions.