Jongor of Lost Land — Fantastic Adventures Cover, October 1940

In the dynamic style of Ziff-Davis pulp cover artists — likely Robert Gibson Jones or a contemporary — this vivid gouache painting crackles with prehistoric menace. A near-naked archer rides a massive horned dinosaur-like beast, loosing an arrow at a swooping red-winged pterodactyl carrying off a human victim. Bold, clashing yellows, pinks, and blues in the banded sky amplify the lost-world drama, showcasing the era's signature blend of Edgar Rice Burroughs-style savage heroism and lurid creature spectacle.