American
Black Stack
TR I
Haystack #4
Haystack #6 (State III)
Casa Cornu
Bonne Bay
Avicenna
Earth Day
, 1967
, 1968
, 1969
, 1970
![Figure 9 [trial proof]](https://api.nga.gov/iiif/af957deb-7c45-4369-8638-4c2240390375/full/843,/0/default.jpg)
![Figure 9 [color trial proof]](https://api.nga.gov/iiif/a6d86825-54ba-4a1a-921a-a56ed4b8b8f0/full/843,/0/default.jpg)
![Figure 9 [trial proof]](https://api.nga.gov/iiif/1520fef4-8093-472e-93aa-8724458aefcc/full/843,/0/default.jpg)
![Figure 9 [color trial proof]](https://api.nga.gov/iiif/91cf5eac-42a3-4cc7-994e-a6d0fe50c521/full/843,/0/default.jpg)
![Figure 9 [trial proof]](https://api.nga.gov/iiif/eb1aa247-f34d-4619-9b25-d2615cc4bbdb/full/843,/0/default.jpg)
![Figure 9 [trial proof]](https://api.nga.gov/iiif/b798700d-5a2c-4174-85b8-4f9789606427/full/843,/0/default.jpg)
