Jefferys, William H.
Discovering astronomy
John Wiley & Sons, 1981
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Robbins, Robert R.
Instructor's manual to accompany Jefferys and Robbins: discovering astronomy
John Wiley & Sons, 1981
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Baker, Robert H.
Astronomy
D. Van Nostrand, 1964
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Hoyle, Fred
Frontiers of astronomy
Harper & Brothers, 1955
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Morrison, David
Frontiers of astronomy
Saunders College, 1990
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