1923
National Gallery of Art, 1963
National Gallery of Art, 1967
National Gallery of Art, 1814
National Gallery of Art, 1992
National Gallery of Art, 1864
National Gallery of Art, 1884
National Gallery of Art, 1972
National Gallery of Art, 1937
National Gallery of Art, 1480
National Gallery of Art, 1914
National Gallery of Art, 1969
![Nilpferdkopf mit geöffnetem Maul (Hippo Mouth Open) [p. 27]](https://api.nga.gov/iiif/40890b8f-34f2-4042-a758-055cee939ead/full/843,/0/default.jpg)
