1967
Gemini G.E.L., 1976
Crutchfield, William, 1970
Gemini G.E.L., 1969
Gemini G.E.L., 1972
Gemini G.E.L., 1999
Gemini G.E.L., 1982
Gemini G.E.L., 1967
Gemini G.E.L., 1973
Gemini G.E.L., 1970
![#4 (after 'Untitled 1975') [trial proof]](https://api.nga.gov/iiif/e412dbd6-a61c-422c-9421-70cf2c494fdb/full/843,/0/default.jpg)
![Figure 7 [progressive proof A]](https://api.nga.gov/iiif/23485099-dc04-4a27-9876-c7dc079d2fa8/full/843,/0/default.jpg)
