R. Robert Robbins

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

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� 3.80

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Discovering Astronomy
Shawl, Stephen J.; Robbins, R. Robert; Jefferys, William H.

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� 5.32

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

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� 10.66

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