1971–1972
National Gallery of Art, 1941
National Gallery of Art, 1778
National Gallery of Art, 1933
National Gallery of Art, 1631
National Gallery of Art, 2023
National Gallery of Art, 1928
National Gallery of Art, 1520
National Gallery of Art, 1996
National Gallery of Art, 1752
National Gallery of Art, 1884
National Gallery of Art, 1870
National Gallery of Art, 1921
![Nilpferdkopf im Profil (Hippo Head) [p. 19]](https://api.nga.gov/iiif/c3aa33e1-6e99-4c90-9d89-04a30b272660/full/843,/0/default.jpg)
