R. Robert Robbins

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DISCOVERING ASTRONOMY
Stephen J Shawl; R Robert Robbins; William H Jefferys

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US$ 7.59

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Modern Astronomy: An Activities Approach
Hemenway, Mary Kay; Robbins, R. Robert

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US$ 7.19

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Discovering Astronomy, Activities Kit
Robbins, R. Robert; Jefferys, William H.; Shawl, Steven J.

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US$ 14.87

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