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In page Edgar Rice Burroughs:

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Burroughs also wrote popular science fiction and fantasy stories involving adventurers from Earth transported to various planets (notably Barsoom, Burroughs's fictional name for Mars, and Amtor, his fictional name for Venus), lost islands (Caspak), and into the interior of the Hollow Earth in his Pellucidar stories. He also wrote Westerns and historical romances. Besides those published in All-Story, many of his stories were published in The Argosy magazine.[citation needed]