. "Authorship attribution: National Gallery of Art, Washington"@en . "Authorship attribution, photograph \"National Gallery of Art, Washington , Raphael. Umbrian. The Alba Madonna. Mellon Collection 1937\": National Gallery of Art, Washington"@en . . . . "Attribuzione di autorialità: National Gallery of Art, Washington"@it . "Attribuzione di autorialità, fotografia \"National Gallery of Art, Washington , Raphael. Umbrian. The Alba Madonna. Mellon Collection 1937\": National Gallery of Art, Washington"@it . . "timbro" . .