1992–1993
National Gallery of Art, 1873
National Gallery of Art, 2019
National Gallery of Art, 1880
National Gallery of Art, 1969
National Gallery of Art, 1960
National Gallery of Art, 1937
National Gallery of Art, 2009
Gemini G.E.L., 1975
National Gallery of Art, 1935
National Gallery of Art, 1938
National Gallery of Art, 1799
![Canyon Clouds [working proof 2]](https://api.nga.gov/iiif/ae1714da-5646-426b-9d2d-7e72539304ad/full/843,/0/default.jpg)
![Ale Cans [trial proof D]](https://api.nga.gov/iiif/f0e5dd50-8a7d-4005-8fd4-59412a8ef237/full/843,/0/default.jpg)
