. "Authorship attribution: National Gallery of Art, Washington"@en . . "timbro" . "Authorship attribution, photograph \"National Gallery of Art, Washington , Raphael. Umbrian. Saint George and the dragon\": National Gallery of Art, Washington"@en . . "Attribuzione di autorialità, fotografia \"National Gallery of Art, Washington , Raphael. Umbrian. Saint George and the dragon\": National Gallery of Art, Washington"@it . . . . "Attribuzione di autorialità: National Gallery of Art, Washington"@it .