- Author: Hans Helweg Author Record # 205913
- Language: English
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Cover Art
- Zip-Zip and His Flying Saucer (1956)
- Zip-Zip Goes to Venus (1958)
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Olga Takes Charge (1987)
also appeared as:
- Interior Art: Olga Takes Charge (cover) (1987)
- Zip-Zip and His Flying Saucer (1956)
- Zip-Zip Goes to Venus (1958)