2007–2017
National Gallery of Art, 1991
National Gallery of Art, 1929
National Gallery of Art, 1854
National Gallery of Art, 1955
National Gallery of Art, 1482
National Gallery of Art, 1997
Frank, Robert, 1951
National Gallery of Art, 1745
National Gallery of Art, 1926
National Gallery of Art, 1939
National Gallery of Art, 1890
National Gallery of Art, 1899
![Untitled [Secondaries with Primaries] [trial proof]](https://api.nga.gov/iiif/cba646ff-42e3-403e-a467-5204aaf4ee65/full/843,/0/default.jpg)
![Untitled [female nude leaning back in chair and facing right [verso]](https://api.nga.gov/iiif/70db580a-1370-4b58-94a9-f8de48ec8190/full/843,/0/default.jpg)
![Sixtus IV (Francesco della Rovere, 1414-1481), Pope 1471 [obverse]](https://api.nga.gov/iiif/8fc57e11-7b1e-4949-9c03-6a12d20cd606/full/843,/0/default.jpg)
![Green Angel 2 [4th element in black proof]](https://api.nga.gov/iiif/227a3181-7bc6-4233-88a6-65b35490af36/full/843,/0/default.jpg)
