1969–1970
National Gallery of Art, 1938
National Gallery of Art, 1754
National Gallery of Art, 1937
National Gallery of Art, 1949
National Gallery of Art, 1976
National Gallery of Art, 1846
National Gallery of Art, 1935
National Gallery of Art, 1840
National Gallery of Art, 1884
National Gallery of Art, 1830
![#6 (after 'Untitled 1975') [progressive proof 2]](https://api.nga.gov/iiif/21449e8a-3c47-418e-bdd1-e1f01ce02806/full/843,/0/default.jpg)
![Skizze mit Fensterausblick (Sketch with View from Window) [p. 10]](https://api.nga.gov/iiif/c9367a7f-d530-4a58-ae52-b5349f6856fa/full/843,/0/default.jpg)
