1976
National Gallery of Art, 1550
National Gallery of Art, 1553
National Gallery of Art, 1956
National Gallery of Art, 1878
National Gallery of Art, 1645
National Gallery of Art, 1936
National Gallery of Art, 1883
National Gallery of Art, 1935
National Gallery of Art, 1700
National Gallery of Art, 1837
National Gallery of Art, 1452
![#6 (after 'Untitled 1975') [progressive proof 13]](https://api.nga.gov/iiif/dae4df82-2617-4b76-84ce-da1bf69a5eb4/full/843,/0/default.jpg)
![Le Vol de Oiseaux (The Flock of Birds) [plate 8]](https://api.nga.gov/iiif/340c4aa8-8957-47f2-971f-78ffa172cc0e/full/843,/0/default.jpg)
