1889
National Gallery of Art, 1887
National Gallery of Art, 1768
National Gallery of Art, 1700
Corcoran Gallery of Art, 1960
Corcoran Gallery of Art, 1947
National Gallery of Art, 1500
National Gallery of Art, 1937
National Gallery of Art, 1635
National Gallery of Art, 1968
National Gallery of Art, 1886
National Gallery of Art, 1935
National Gallery of Art, 1884
![Inscription [reverse]](https://api.nga.gov/iiif/24a7656c-b147-4133-af58-8915d3f70fe4/full/843,/0/default.jpg)
![Nilpferdkopf mit geöffnetem Maul (Hippo Mouth Open) [p. 27]](https://api.nga.gov/iiif/40890b8f-34f2-4042-a758-055cee939ead/full/843,/0/default.jpg)