1976
National Gallery of Art, 1955
National Gallery of Art, 1956
National Gallery of Art, 1937
National Gallery of Art, 1575
National Gallery of Art, 1643
National Gallery of Art, 1951
National Gallery of Art, 1944
National Gallery of Art, 1938
National Gallery of Art, 1932
National Gallery of Art, 1630
National Gallery of Art, 1935
![#6 (after 'Untitled 1975') [progressive proof 12]](https://api.nga.gov/iiif/8b92f0be-db4c-4d7f-8224-d6a41153010d/full/843,/0/default.jpg)
![Portrait of Wolfgang Frommel [p. 25]](https://api.nga.gov/iiif/2df969e9-ec3c-4874-b105-3b92c342d435/full/843,/0/default.jpg)
