1545–1555
National Gallery of Art, 1879
National Gallery of Art, 1831
National Gallery of Art, 1960
National Gallery of Art, 1570
National Gallery of Art, 1903
National Gallery of Art, 1665
National Gallery of Art, 1908
National Gallery of Art, 1673
National Gallery of Art, 1494
National Gallery of Art, 1945
National Gallery of Art, 1880
National Gallery of Art, 1959
![Studies of a Head [verso]](https://api.nga.gov/iiif/1caeadfc-2105-43e8-83aa-8aaf576b889a/full/843,/0/default.jpg)
![Minerva Resting on a Spear and Shield [reverse]](https://api.nga.gov/iiif/233eb9c7-c33e-438b-9a52-67885f2a15c7/full/843,/0/default.jpg)
