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extraterrestrial civilization

  1. The seven temporary moons
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    Murray Leinster
    The seven temporary moons
  2. The cosmic jackpot
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    George O. Smith
    The cosmic jackpot
  3. Galactic heritage
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    Frank Belknap Long
    Galactic heritage
  4. Quest to Centaurus
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    George O. Smith
    Quest to Centaurus
  5. Menace From Vega
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    Randall Garrett
    Menace From Vega
  6. Give Back a World
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    Raymond Z. Gallun
    Give Back a World
  7. Manners and Customs of the Thrid
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    Murray Leinster
    Manners and Customs of the Thrid
  8. Captain Peabody
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    Rog Phillips
    Captain Peabody
  9. The Margenes
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    Miriam Allen De Ford
    The Margenes
  10. Arcturus Times Three
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    Jack Sharkey
    Arcturus Times Three
  11. Round-and-Round Trip
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    H. B. Fyfe
    Round-and-Round Trip
  12. Dr. Kometevsky's Day
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    Fritz Leiber
    Dr. Kometevsky's Day
  13. The Metal Moon
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    Everett C. Smith
    The Metal Moon
  14. The black alarm
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    George O. Smith
    The black alarm

  15. Zehru of Xollar

    Hal K. Wells

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    Hal K. Wells
    Zehru of Xollar

  16. Beyond Pandora

    Robert J. Martin

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    Robert J. Martin
    Beyond Pandora
  17. Planet of the Gods
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    Robert Moore Williams
    Planet of the Gods
  18. Let There Be Light
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    H. B. Fyfe
    Let There Be Light
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