1982
National Gallery of Art, 1935
National Gallery of Art, 1809
National Gallery of Art, 1890
National Gallery of Art, 1862
National Gallery of Art, 1939
National Gallery of Art, 1989
National Gallery of Art, 1884
National Gallery of Art, 1847
National Gallery of Art, 1985
National Gallery of Art, 1916
National Gallery of Art, 1777
National Gallery of Art, 1956
![Untitled (Red) [trial proof]](https://api.nga.gov/iiif/c6acef00-225e-439a-b806-27bbe58415c9/full/843,/0/default.jpg)
![Nilpferdkopf im Profil (Hippo Head) [p. 19]](https://api.nga.gov/iiif/c3aa33e1-6e99-4c90-9d89-04a30b272660/full/843,/0/default.jpg)
