1950
Unknown, 1962
National Gallery of Art, 1861
National Gallery of Art, 1887
National Gallery of Art, 1745
National Gallery of Art, 1541
National Gallery of Art, 1975
National Gallery of Art, 1834
National Gallery of Art, 1935
National Gallery of Art, 1955
National Gallery of Art, 1976
National Gallery of Art, 1977
National Gallery of Art, 1612
![Flagstones (a) [trial proof 2]](https://api.nga.gov/iiif/76074520-bf5e-4032-bec1-580b18de84a4/full/843,/0/default.jpg)
