1939
Williams, Dave H. and Reba W., 1964
National Gallery of Art, 1845
National Gallery of Art, 1922
National Gallery of Art, 1884
Williams, Dave H. and Reba W., 1939
National Gallery of Art, 1924
National Gallery of Art, 1857
National Gallery of Art, 1967
National Gallery of Art, 1956
National Gallery of Art, 1610
National Gallery of Art, 1935
National Gallery of Art, 1858
![Nilpferd in Rückenansicht (Hippo from behind) [p. 24]](https://api.nga.gov/iiif/677c4363-3a31-43b6-b350-da3b208da0e2/full/843,/0/default.jpg)
![Title Page from 1st Etchings, 2nd State [trial proof]](https://api.nga.gov/iiif/807780bd-91fd-48df-9b55-038ff458d441/full/843,/0/default.jpg)
