1968
Gemini G.E.L., 1986
Gemini G.E.L., 1979
Richard Wilke, 1969
Gemini G.E.L., 1973
Gemini G.E.L., 1968
James Webb, 1976
James Webb, 1968
Gemini G.E.L., 1969
Gemini G.E.L., 1972
![Room [special proof]](https://api.nga.gov/iiif/3e026106-9c25-493e-995f-89f077bfc8a9/full/843,/0/default.jpg)
![Figure 3 [trial proof]](https://api.nga.gov/iiif/bb244ffa-bedb-4287-b461-569de13cedb5/full/843,/0/default.jpg)
![Figure 7 [working proof]](https://api.nga.gov/iiif/6c0a537e-66ff-48ef-8b3c-04f8642b8dd9/full/843,/0/default.jpg)
![#3 (after 'Untitled 1975') [trial proof]](https://api.nga.gov/iiif/8169f808-7479-4209-8836-a0235ad6d5d5/full/843,/0/default.jpg)
![Figure 4 [trial proof]](https://api.nga.gov/iiif/bf14db92-7716-423b-ab3c-a9ac182c912e/full/843,/0/default.jpg)
![Viola [trial proof 1]](https://api.nga.gov/iiif/1fab94ba-76bd-433a-9cc3-e987c49b73ed/full/843,/0/default.jpg)
