Books by Paul, Frank R. (Frank Rudolph)
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See also: en.wikipedia
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The Airlords of Han
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Armageddon—2419 A.D.
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When the Sun went out
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The color of space
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In Caverns Below
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Outpost on Io
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The Man Higher Up
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The sunken world
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Colossus of Chaos
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The Coming of the Ice
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Ice Planet
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A voice from the inner world
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Through the crater's rim
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The War-Nymphs of Venus
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The Flame Breathers
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The space visitors
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The Ultimate Salient
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The alien intelligence
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The artificial man
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Invaders of the Forbidden Moon
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Electro-episoded in A.D. 2025
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The Star-Master
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The terrors of the upper air
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The second shell
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The invisible master