1880–1890
National Gallery of Art, 1944
National Gallery of Art, 1937
National Gallery of Art, 1919
National Gallery of Art, 1872
National Gallery of Art, 1938
National Gallery of Art, 1936
National Gallery of Art, 1976
National Gallery of Art, 1939
National Gallery of Art, 1940
National Gallery of Art, 1884
National Gallery of Art, 1630
National Gallery of Art, 1505
![Figure 4 [trial proof 5]](https://api.nga.gov/iiif/f5e95ebe-dcfd-48d6-acb6-e5b0bd2509cf/full/843,/0/default.jpg)
![Two Cow's Heads [verso]](https://api.nga.gov/iiif/b0e65972-ba4c-4686-b78f-d69803a06555/full/843,/0/default.jpg)
