See Allo

Chapman, Robert D., author

Discovering astronomy

W.H. Freeman, 1978

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Jefferys, William H., author

Discovering astronomy

John Wiley & Sons, 1981

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Robbins, Robert R., author

Instructor's manual to accompany Jefferys and Robbins: discovering astronomy

John Wiley & Sons, 1981

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Baker, Robert H., author

D. Van Nostrand, 1964

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Morrison, David, author

Frontiers of astronomy

Saunders College, 1990

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