1930
National Gallery of Art, 1971
National Gallery of Art, 1935
National Gallery of Art, 1970
National Gallery of Art, 1547
National Gallery of Art, 1960
National Gallery of Art, 1938
National Gallery of Art, 1991
National Gallery of Art, 1837
National Gallery of Art, 1937
National Gallery of Art, 1949
National Gallery of Art, 1966
![Bent "Blue" [trial proof]](https://api.nga.gov/iiif/0897b9bd-7a5c-4315-b3e0-da35c5fc8db7/full/843,/0/default.jpg)
![Citadel of Piacenza [reverse]](https://api.nga.gov/iiif/46df1860-ba58-47e7-9ff4-57a20fe77ca5/full/843,/0/default.jpg)
