Columbia subject headings:
Harvard subject headings:
Art museums--England--Hertfordshire--Catalogs.
Painting, British--Catalogs.
Painting, European--Catalogs.
Painting--England--Hertfordshire--Catalogs.
Princeton subject headings:
Art museums--England--Hertfordshire--Catalogs.
Catalogs.
Painting, British--Catalogs.
Painting--England--Hertfordshire--Catalogs.