1833
National Gallery of Art, 1936
National Gallery of Art, 1960
National Gallery of Art, 1754
National Gallery of Art, 1938
National Gallery of Art, 1935
National Gallery of Art, 1550
National Gallery of Art, 1925
National Gallery of Art, 1933
National Gallery of Art, 1705
National Gallery of Art, 1902
National Gallery of Art, 1991
National Gallery of Art, 1941
![Uniting Europe [reverse]](https://api.nga.gov/iiif/e8a1207b-9d0c-404b-8562-2faa42386c9c/full/843,/0/default.jpg)
![Forty Flakes [preparatory drawing]](https://api.nga.gov/iiif/9458545f-fb18-43b8-970b-4577f718044b/full/843,/0/default.jpg)
