Columbia subject headings:
Museo del Prado--Catalogs.
Portrait painting, Spanish--Catalogs.
Portrait painting--Spain--Madrid--Catalogs.
Harvard subject headings:
Museo del Prado--Catalogs.
Portrait painting, Spanish--Catalogs.
Portrait painting--Spain--Madrid--Catalogs.
Princeton subject headings:
Museo del Prado.
Portrait painting, European.
Portraits--Spain--Madrid.