Columbia subject headings:
Altarpieces.
Enamel and enameling--Spain.
San Miguel de Aralar (Sanctuary)
Harvard subject headings:
Altarpieces.
Enamel and enameling
San Miguel de Excelsis (Shrine)
Princeton subject headings:
Altarpieces.
Enamel and enameling.
San Miguel de Excelsis (Shrine)