WThe Caves of SteelWThe Forgotten PlanetWG.O.G. 666WI Am Legend (novel)WMartians, Go HomeWMel Oliver and Space Rover on MarsWA Mirror for ObserversWOperation: Outer SpaceWQuestion and Answer (novel)WReturn to the Lost PlanetWSearch the SkyWThe Secret of Saturn's RingsWThe Sky Is Falling (Del Rey novel)WThe Star BeastWThe Stars Are Ours!WStarship Through SpaceWThey'd Rather Be RightWThree Thousand YearsWThe Wonderful Flight to the Mushroom Planet