1967
Gemini G.E.L., 1990
Gemini G.E.L., 1983
Kenneth Tyler, 1966
Frank Stella, 1980
Frank Stella, 1982
Gemini G.E.L., 1977
Gemini G.E.L., 1971
Gemini G.E.L., 1969
Gemini G.E.L., 1982
Kenneth Tyler, 1971
Kenneth Tyler, 1967
![Untitled [trial proof]](https://api.nga.gov/iiif/c3efb80f-1c47-449f-b9a0-9288e530423e/full/843,/0/default.jpg)
![0 through 9 [trial proof]](https://api.nga.gov/iiif/418aeb8d-2947-407b-add1-3fb4ffbb6bf5/full/843,/0/default.jpg)
![Delaware Crossing [color trial proof]](https://api.nga.gov/iiif/671ce331-d8cb-47c1-a606-594828a245d4/full/843,/0/default.jpg)
![Figure 6 [working proof]](https://api.nga.gov/iiif/379aed58-8467-4ec5-b77a-6bca2ca431bc/full/843,/0/default.jpg)
![Good Time Charley II [working proof]](https://api.nga.gov/iiif/3dae0827-111a-4367-ba7a-634e5a6fefa1/full/843,/0/default.jpg)
