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Edgar Rice Burroughs

Dejah Thoris of Mars as pleasure slave (purr-hiss) [John Carter of Mars, Edgar Rice
Edgar Rice Burroughs' John Carter of Mars by Joe Jusko [NSFW]
Bruce Pennington cover art for the 1975 edition of Edgar Rice Burroughs’s A Princess
"Pirates of Venus" by Edgar Rice Burroughs, cover of a Russian edition