1903–1970
National Gallery of Art, 1936
National Gallery of Art, 1651
National Gallery of Art, 1976
National Gallery of Art, 1546
National Gallery of Art, 1962
National Gallery of Art, 1956
National Gallery of Art, 1485
National Gallery of Art, 1972
National Gallery of Art, 1612
National Gallery of Art, 1938
National Gallery of Art, 1910
![Study of Heads [verso]](https://api.nga.gov/iiif/f6326b01-640f-4da4-8965-aa556f9f1225/full/843,/0/default.jpg)
![Zone [trial proof 4]](https://api.nga.gov/iiif/abaee809-c64a-4efa-9539-97ab064e85d9/full/843,/0/default.jpg)
