1971
Gemini G.E.L., 1980
Gemini G.E.L., 1978
Gemini G.E.L., 1993
Gemini G.E.L., 1971
Sam Francis, 1963
Gemini G.E.L., 1967
Gemini G.E.L., 1982
Ron Adams, 1969
Ron Adams, 1971
Gemini G.E.L., 1970
![Yunan (State III) [artist's proof]](https://api.nga.gov/iiif/4d5cd6e8-de39-424e-b601-1049ad681b24/full/843,/0/default.jpg)
![Drypoint Theta [special proof]](https://api.nga.gov/iiif/86d9b732-bd19-4790-b277-3298550bbd77/full/843,/0/default.jpg)
![Delaware Crossing [color trial proof]](https://api.nga.gov/iiif/26731a48-174e-4989-af74-301c95760617/full/843,/0/default.jpg)