1999
National Gallery of Art, 1966
National Gallery of Art, 1976
National Gallery of Art, 1805
National Gallery of Art, 1879
National Gallery of Art, 1951
National Gallery of Art, 1936
National Gallery of Art, 1808
National Gallery of Art, 1912
National Gallery of Art, 1986
National Gallery of Art, 1924
National Gallery of Art, 1837
![Flagstones (b) [trial proof 6]](https://api.nga.gov/iiif/5940683e-619f-42f7-ad99-033332401401/full/843,/0/default.jpg)
