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Collects 16 issues

• Adventures into the Unknown #641955-07-00
• Out of This World #161959-12-00
• Unknown Worlds #111961-10-00
• Forbidden Worlds #1001961-11-00
• Unknown Worlds #121961-12-00
• Adventures into the Unknown #1301962-02-00
• Adventures into the Unknown #1331962-06-00
• Forbidden Worlds #1041962-07-00
• Space Adventures #561964-03-10
• Mysteries of Unexplored Worlds #381963-10-00