1917
National Gallery of Art, 1976
National Gallery of Art, 1582
National Gallery of Art, 1937
National Gallery of Art, 1954
National Gallery of Art, 1728
National Gallery of Art, 1576
National Gallery of Art, 1959
National Gallery of Art, 1938
National Gallery of Art, 1967
National Gallery of Art, 1966
National Gallery of Art, 1769
![#6 (after 'Untitled 1975') [progressive proof 4]](https://api.nga.gov/iiif/83811d43-0371-4a80-893c-14df34d5290f/full/843,/0/default.jpg)
![Flags [trial proof]](https://api.nga.gov/iiif/f4883f9a-aee2-4564-b3cf-7c19aaa89c9b/full/843,/0/default.jpg)
