- ·Cactus, study
- ·1973
- ·43 cm
- ·Ink, paper
- ·00.163.1.
- ·Cactus, study
- ·1973
- ·52 cm
- ·Ink, paper
- ·00.161.4.
- ·Cactus, study
- ·1973
- ·33 cm
- ·Ink, paper
- ·00.161.6.
- ·Cactus, study
- ·1973
- ·52 cm
- ·Ink, paper
- ·00.161.2.
- ·Cactus, study
- ·1973
- ·52 cm
- ·Ink, paper
- ·00.161.5.
- ·Cactus, study
- ·1973
- ·52 cm
- ·Ink, paper
- ·00.161.3.