Otis Adelbert Kline’s thrilling *The Outlaws of Mars* remains a high watermark in the classic planetary romance tradition popularized by Edgar Rice Burroughs. Originally serialized in *Argosy Weekly* in 1933, this planetary adventure delivers mind-swapping, exotic alien beasts, and high-stakes swordplay on the Red Planet. This incredibly clean copy is ideal for collectors of vintage Martian sci-fi and classic mid-century paperbacks.