1968
Gemini G.E.L., 1979
Gemini G.E.L., 1967
Woodward Foundation, 1962
Gemini G.E.L., 1990
James Webb, 1972
Richard Wilke, 1969
Gemini G.E.L., 1974
Gemini G.E.L., 1969
Gemini G.E.L., 1977
Gemini G.E.L., 1976
Gemini G.E.L., 1980
Gemini G.E.L., 1986
![Sea Group [special proof]](https://api.nga.gov/iiif/6cc5100b-0653-42aa-ba28-dae3deb6d80c/full/843,/0/default.jpg)
![Zone [trial proof 6]](https://api.nga.gov/iiif/39ebf91c-690c-4ad3-825f-2dc12d0f6dd2/full/843,/0/default.jpg)
![#6 (after 'Untitled 1975') [progressive proof 13]](https://api.nga.gov/iiif/dae4df82-2617-4b76-84ce-da1bf69a5eb4/full/843,/0/default.jpg)
![Drypoint Mu [special proof]](https://api.nga.gov/iiif/773313f4-2297-4ac3-a5b1-01d924ed5745/full/843,/0/default.jpg)
