1967
Gemini G.E.L., 1972
Gemini G.E.L., 1980
Gemini G.E.L., 1984
William Crutchfield, 1970
Gemini G.E.L., 1968
Gemini G.E.L., 2007
Gemini G.E.L., 1969
Gemini G.E.L., 1973
Gemini G.E.L., 1986
Gemini G.E.L., 1991
Gemini G.E.L., 1967
![Drypoint Lambda [special proof]](https://api.nga.gov/iiif/f2e1db6b-8d67-4964-8547-bdfdda54fe13/full/843,/0/default.jpg)
![Figure 7 [trial proof]](https://api.nga.gov/iiif/c4c2b990-d784-4391-b170-bce485df9b0a/full/843,/0/default.jpg)
![Four Panels from Untitled 1972 [C panel, trial proof 5]](https://api.nga.gov/iiif/3b3f0ca3-37fd-4885-a4b7-78a02265e09f/full/843,/0/default.jpg)
