1971
National Gallery of Art, 1956
National Gallery of Art, 1976
National Gallery of Art, 1684
National Gallery of Art, 1935
National Gallery of Art, 1939
National Gallery of Art, 1569
National Gallery of Art, 1754
National Gallery of Art, 1490
National Gallery of Art, 1953
National Gallery of Art, 1937
National Gallery of Art, 1923
![Bent "Blue" [working proof]](https://api.nga.gov/iiif/25190e59-6ffb-4652-ab02-8434c9babb59/full/843,/0/default.jpg)
![#6 (after 'Untitled 1975') [progressive proof 8]](https://api.nga.gov/iiif/2e7abb66-a6d9-493c-93f8-39e87ac94f7a/full/843,/0/default.jpg)
