- Series: David Démon Series Record # 53081
- David Démon
- Mars im Morgenlicht (1968) by Gert Sandow [only as by Gerd Sandow]
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Das Unheil lauert draußen?Das Unheil lauert draussen(1968) by Gert Sandow
- Countdown für Projekt "P-IV" (1968) [SF] by Gert Sandow [only as by Joachim Puhle]
- Unternehmen "Prima" (1969) [SF] by Gert Sandow [only as by Joachim Puhle]
- Radio-Gold vom Mars (1969) [SF] by Gert Sandow [only as by Joachim Puhle]