- E-bookThe Prince of PerilOtis Kline
- E-bookJan in IndiaOtis Kline
- E-bookJan of the JungleOtis Kline
- E-bookThe Man from the MoonOtis Kline
- E-bookThe Revenge of the RobotOtis Kline
- E-bookThe Call of the SavageOtis Kline
- E-bookSéries: The Venus TrilogyOtis Kline
- E-bookThe Port of PerilOtis Kline
- E-bookThe Outlaws of MarsOtis Kline
- E-bookThe Planet of PerilOtis Kline
- E-bookThe Swordsman of MarsOtis Kline