Columbia subject headings:
Drawing--Private collections--England--Windsor (Windsor and Maidenhead)--Catalogs.
Elizabeth II, Queen of Great Britain, 1926---Art collections--Catalogs.
Guercino, 1591-1666--Catalogs.
Windsor Castle. Royal Library--Catalogs.
Harvard subject headings:
Drawing--Private collections--England--Windsor (Berkshire)--Catalogs.
Elizabeth II, Queen of Great Britain, 1926---Art collections--Catalogs.
Guercino, 1591-1666--Catalogs.
Windsor Castle. Royal Library--Catalogs.
Princeton subject headings:
Drawing--Private collections--England--Windsor (Berkshire)--Catalogs.
Elizabeth II, Queen of Great Britain, 1926-2022--Art collections--Catalogs.
Guercino, 1591-1666--Catalogs.
Windsor Castle. Royal Library--Catalogs.