Frazetta also produced paintings for paperback editions of adventure books. His interpretation of Conan visually redefined the genre of sword and sorcery, and had an enormous influence on succeeding generations of artists. From this point on, Frazetta's work was in great demand. His covers were used for other paperback editions of classic Edgar Rice Burroughs books, such as those from the Tarzan and Barsoom (John Carter of Mars) series. He also did several pen and ink illustrations for many of these books. His cover art only coincidentally matched the storylines inside the books, as Frazetta once explained: "I didn't read any of it... I drew him my way. It was really rugged. And it caught on. I didn't care about what people thought. People who bought the books never complained about it. They probably didn't read them."