- ·Cactus, study
- ·1974
- ·52 cm
- ·Ink, paper
- ·00.161.9.
- ·Cactus, study
- ·1975
- ·43 cm
- ·Ink, paper
- ·00.163.4.
- ·Cactus, study
- ·1975
- ·43 cm
- ·Ink, paper
- ·00.163.6.
- ·Cactus, study
- ·1975
- ·43 cm
- ·Ink, paper
- ·00.163.7.
- ·Cactus, study
- ·1975
- ·43 cm
- ·Ink, paper
- ·00.163.10.
- ·Cactus, study
- ·1975
- ·43 cm
- ·Ink, paper
- ·00.163.11.