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21

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Astronomy on the web : a brief guide to the internet

by Kurland
Published 1999

22

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Astronomy : a beginner's guide to the universe

by Chaisson
Published 1998

23

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by KALER
Published 1994

24

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The COSMIC perspective

Published 1998

25

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The World treasury of physics, astronomy, and mathematics

Published 1991

26

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Published 1980

27

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The Amateur astronomer's pathfinder

by HMPHREY
Published 1992

28

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The cosmic inquirers : modern telescopes and their makers

by TUCKER
Published 1986

29

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Astronomy : a beginner's guide to the universe

by Chaisson, Eric
Published 2013

30

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Horizons : exploring the universe

by Seeds, Michael A.
Published 2014