1971
Gemini G.E.L., 1992
Gemini G.E.L., 1973
Gemini G.E.L., 1978
Gemini G.E.L., 1975
Gemini G.E.L., 2004
Gemini G.E.L., 1990
Gemini G.E.L., 1970
Gemini G.E.L., 1972
Gemini G.E.L., 1969
![Four Panels from Untitled 1972 [D panel, working proof 2]](https://api.nga.gov/iiif/115d1c97-1fd4-46bf-8c28-e6dde9c9d8ec/full/843,/0/default.jpg)
![Figure 4 [experimental trial proof]](https://api.nga.gov/iiif/751d8a1e-a0dc-4d55-9070-cb1081769801/full/843,/0/default.jpg)