Books by Bok, Hannes
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See also: en.wikipedia
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The shadow over Innsmouth
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Dragon moon
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I, Mars
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The Star of Satan
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The band played on
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Pogo Planet
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The man on the meteor
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The Stellar Legion
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The Soul Stealers
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Crisis!
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The impossible invention
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Thief of Mars
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Proktols of Neptune
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Treasure of Triton
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Master Race
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Stranger From Space
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One touch of Terra