- ·Cactus, study
- ·1974
- ·42 cm
- ·Ink, paper
- ·00.280.6.
- ·Cactuses, study
- ·1974
- ·50 cm
- ·Ink, paper
- ·00.89.1.
- ·Cactuses, study
- ·1974
- ·52 cm
- ·Ink, paper
- ·00.161.8.
- ·Cactuses, study
- ·1975
- ·43 cm
- ·Ink, paper
- ·00.280.15.
- ·Cactus, study
- ·1975
- ·42 cm
- ·Ink, paper
- ·00.90.1.
- ·Cactus, study
- ·1975
- ·42 cm
- ·Ink, paper
- ·00.280.9.