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  1. 1
    Asteroid
    by ASIMOV
    Published 1993
  2. 2
    Target earth the search for rogue asteroids
    by Steel
    Published 2000
  3. 3
    Could an asteroid hit the earth? asteroids, comets, meteors, and more
    by Mist
    Published 2006
  4. 4
    Impact earth asteriods, comets and meteoroids the growing threat
    by Atkinson
    Published 2000
  5. 5
    Asteroids, comets, and meteorites
    by Kortenkamp
    Published 2008
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