1969
Robert Rauschenberg, 1987
Gemini G.E.L., 1972
Robert Rauschenberg, 1979
Robert Rauschenberg, 1973
Gemini G.E.L., 1973
Gemini G.E.L., 1974
Daniel Freeman, 1969
Ron Adams, 1971
Gemini G.E.L., 1980
Robert Rauschenberg, 1980
Gemini G.E.L., 1978
![Figure 0 [experimental proof]](https://api.nga.gov/iiif/c0d5b13b-54c8-4d1a-ba73-cb0a1895630c/full/843,/0/default.jpg)
![Coathanger and Spoon [proof]](https://api.nga.gov/iiif/349401ac-7c1a-44b3-b5f1-15064ec2ee4c/full/843,/0/default.jpg)
![Drypoint Epsilon [special proof]](https://api.nga.gov/iiif/931b0d88-3da6-475b-9a3f-dbdac553901d/full/843,/0/default.jpg)
