1970–1980
National Gallery of Art, 1981
National Gallery of Art, 1635
National Gallery of Art, 1936
National Gallery of Art, 1884
National Gallery of Art, 1929
National Gallery of Art, 1652
National Gallery of Art, 1854
National Gallery of Art, 1930
National Gallery of Art, 1834
National Gallery of Art, 1974
National Gallery of Art, 1658
![Abstraction, Belief, Desire [working proof 8 for panel C]](https://api.nga.gov/iiif/b8797162-ffda-487b-b006-ee70f800576a/full/843,/0/default.jpg)
![Begonnener Pferdekopf (Beginning Sketch of Horse Head) [p. 7]](https://api.nga.gov/iiif/3a3bbb04-5daa-4f15-9d62-f84a4a7627c6/full/843,/0/default.jpg)
