In A Princess of Mars, John Carter is transported to a Mars inhabited by strange civilizations and embarks on various adventures on his quest home. Often held up as a seminal example of pulp science fiction, A Princess of Mars is the first entry in Burroughs’ epic Martian series, and the first to feature the character of John Carter. Though often categorized as just a pulp adventure tale, A Princess of Mars was hugely influential on many budding science fiction writers, professional scientists, and explorers of the day. The novel remains a light, fast-paced, and enjoyable read, and continues to inspire adaptations nearly a hundred years after its publication.

Isaac Asimov’s reputation precedes him; his prolific output of science fiction novels and short stories between the 1940s and the 1990s, along with his many Hugo and Nebula awards, cemented his reputation as the premier science fiction author of his time. His writing, at least in the first half of his career, focused on “hard” science fiction: stories that were broadly founded in realistic science. Indeed, as well as writing fiction, he was a professor of biochemistry, and wrote a wide variety of popular science essays and books. This collection brings together the few Asimov science fiction short stories that are currently known to have passed into the U.S. public domain, arranged in order of publication. It includes one focused on robots and the positronic brain, a subject that he would return to many times over his career.

Dr. William Dyer of New England’s Miskatonic University recounts his experiences on an Antarctic expedition leading to strange, enormous mountains deep within the frozen continent, hiding prehuman horrors only spoken of in esoteric tomes. Reflecting H. P. Lovecraft’s interest in the Antarctic—a continent still very unknown in the 1930s—this story gives a detailed account of the geology and history of Lovecraft’s universe. The dry, scientific text gradually becomes more suspenseful as the expedition uncovers more and more of the cosmic horrors Lovecraft became famous for. Taking inspiration from Edgar Allen Poe’s Arthur Gordon Pym and geological discoveries in his time, as well as building on his world established in previous works, At the Mountains of Madness establishes a story following the natural sense of mystery evoked by the frozen and uninhabited southernmost continent.

H. G. Wells’ classic tale of alien invasion has to this day never been out of print. Like many works of the era, it was originally published as a serial—though the publisher, Pearson’s Magazine, demanded to know the ending before committing to publication. The War of the Worlds, with its matter-of-fact narrative style and deft mixture of contemporary science and fictionalized interstellar war machines, became an instant hit. Its themes of colonialism, social Darwinism, good and evil, and total war still resonate with modern-day readers, so much so that it’s been continuously adapted for screen, radio, television, comics, and print.