Chapman, Robert D.
Discovering astronomy
W.H. Freeman, 1978
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Shaffer, Rick
Introduction to astronomy
Gramercy Books, 1994
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Chaisson, Eric
Astronomy today
Prentice-Hall, 1999
Multimedia
Jefferys, William H.
Discovering astronomy
John Wiley & Sons, 1981
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Hoyle, Fred
Frontiers of astronomy
Harper & Brothers, 1955
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