Willy Ley

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Worlds of the past

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Willy Ley's exotic zoology

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Willy Ley's For your information: On earth and in t …

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Watchers of the Sky : An Informal History of Astron …

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Visitors from afar: The comets

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The borders of mathematics

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The Lungfish, the Dodo, Ahd the Unicorn: An Excursi …

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The Exploration of Mars

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The Conquest of Space

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Satellites, rockets, and outer space (Signet scienc …