- eBookThe Prince of PerilOtis Kline
- eBookJan of the JungleOtis Kline
- eBookJan in IndiaOtis Kline
- eBookThe Man from the MoonOtis Kline
- eBookThe Revenge of the RobotOtis Kline
- eBookThe Call of the SavageOtis Kline
- eBookSeri: The Venus TrilogyOtis Kline
- eBookThe Outlaws of MarsOtis Kline
- eBookThe Port of PerilOtis Kline
- eBookThe Planet of PerilOtis Kline
- eBookThe Swordsman of MarsOtis Kline