- ·Cactus, study
- ·1974
- ·40 cm
- ·Ink, paper
- ·00.162.2.
- ·Cactus, study
- ·1974
- ·40 cm
- ·Ink, paper
- ·00.162.1.
- ·Cactus, study
- ·1974
- ·40 cm
- ·Ink, paper
- ·00.280.1.
- ·Cactuses, study
- ·1974
- ·52 cm
- ·Ink, paper
- ·00.161.7.
- ·Cactuses, study
- ·1974
- ·52 cm
- ·Ink, paper
- ·00.161.1.
- ·Cactus, study
- ·1974
- ·43 cm
- ·Ink, paper
- ·00.163.2.