1966
National Gallery of Art, 1980
National Gallery of Art, 1722
Patrons' Permanent Fund, 1969
National Gallery of Art, 1846
National Gallery of Art, 1550
National Gallery of Art, 1824
National Gallery of Art, 1960
National Gallery of Art, 1521
National Gallery of Art, 1899
Patrons' Permanent Fund, 1963
National Gallery of Art, 1853
National Gallery of Art, 1750
![Ruler [trial proof]](https://api.nga.gov/iiif/e545e02a-0c94-45c6-91d0-8802c7b5629a/full/843,/0/default.jpg)
![Untitled, Second State (Ruler and Fork) [trial proof]](https://api.nga.gov/iiif/72e75b74-7fee-43be-8125-672e0c4e9158/full/843,/0/default.jpg)
![#41 [proof]](https://api.nga.gov/iiif/fb5ad94b-d078-4dca-ba4c-48c2f8135ab3/full/843,/0/default.jpg)
