1924–2001
National Gallery of Art, 1899
National Gallery of Art, 1943
National Gallery of Art, 1903
National Gallery of Art, 1500
National Gallery of Art, 1936
National Gallery of Art, 1968
National Gallery of Art, 1787
National Gallery of Art, 1940
National Gallery of Art, 1884
National Gallery of Art, 1821
National Gallery of Art, 1645
![Francesco I Sforza, 1401-1466, 4th Duke of Milan 1450 [obverse]](https://api.nga.gov/iiif/9463c4ad-2392-49b4-ba22-8c8271408cdd/full/843,/0/default.jpg)
![Detailstudie eines Violoncello (Study of a Violin) [p. 3]](https://api.nga.gov/iiif/c0c1e603-fbaf-4234-aab1-32ebd27b0b9a/full/843,/0/default.jpg)
