- Series: Umweltverschmutzung Series Record # 43964
- Umweltverschmutzung
- 1 Stirbt unser blauer Planet? (1973) [ES] by Dirk Hess and William Voltz [only as by D. Heß and W. Voltz]
- 2 Müllplanet Erde (Die unsichtbare Sonne) (1973) [ES] by Dirk Hess and William Voltz [only as by Dirk Heß and William Voltz]
- 3 Müllplanet Erde (Hinter der Antimateriewolke) (1973) [ES] by Dirk Hess and William Voltz [only as by Dirk Heß and W. Voltz]
- 4 Arsen und Spitzenhäubchen (1973) [ES] by Dirk Hess and William Voltz [only as by Dirk Heß and William Voltz]