I’v always loved the Michael Whelan cover Martian Tales books by Edgar Rice Burroughs. Got a stack of them in the shop – missing the last book (#11) alas. They are neither rare nor expensive, but the colorful art is a joy.
Shop link. (Redirect to Home page = They’re sold)
See all our Appendix N fiction
See another ERB set also in the shop: Tarzan Series, Books 1 to 18
See also: Lankhmar 6-book set: Classic Appendix N fantasy
John Carter: Warlord of Mars adventure game (SPI, 1979)