1980–1985
Gemini G.E.L., 1982
Gemini G.E.L., 1981
Ron McPherson, 1973
Gemini G.E.L., 1986
Gemini G.E.L., 1978
Ron McPherson, 1972
Gemini G.E.L., 1974
Gemini G.E.L., 1972
Gemini G.E.L., 1971
Gemini G.E.L., 1989
![Cicada [trial proof]](https://api.nga.gov/iiif/022c055d-bf96-4279-a387-f21d87820f14/full/843,/0/default.jpg)
![Four Panels from Untitled 1972 [D panel, trial proof 15]](https://api.nga.gov/iiif/d83c39d8-218c-4a50-8360-ba78d965fd42/full/843,/0/default.jpg)
![Delaware Crossing [color trial proof]](https://api.nga.gov/iiif/e9a5612d-0efc-4b70-9b81-e99b1d2f5371/full/843,/0/default.jpg)
