Out of This World #11

This anthology issue contains at least two stories: "Let Sleeping Robots Lie," in which young anthropologists discover a dormant robot and decide to explore an inner valley while keeping their discovery secret, planning to claim they're digging for gold if questioned; and "Mystery from Mars," depicting an unhappy alien from Mars struggling to adjust to his new surroundings on Earth, with his human handlers concerned about his emotional state and conducting behavioral tests on him.