1972
National Gallery of Art, 1753
National Gallery of Art, 1930
National Gallery of Art, 1782
National Gallery of Art, 1940
National Gallery of Art, 1935
National Gallery of Art, 1917
National Gallery of Art, 1967
National Gallery of Art, 1575
National Gallery of Art, 1960
National Gallery of Art, 1931
National Gallery of Art, 1810
Universal Limited Art Editions, 1960
![Two Flags [trial proof]](https://api.nga.gov/iiif/6a3913a1-38bd-46b8-abbe-08fbf24c7aae/full/843,/0/default.jpg)
![0 from 0-9 (Black) [trial proof]](https://api.nga.gov/iiif/4ee66403-08eb-4bb4-aa50-7affbe0d8ce4/full/843,/0/default.jpg)