Judy & David Gershon
Showing 25–31 of 31 results
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The Day All the Rulers Disappeared (Nonstandard Linear Measurement)
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The Day All the Rulers Reappeared (Linear Measurement)
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The Minute Song (Time)
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The Probability Dance
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The Symma Tree (Symmetry)
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Twelve Slices of Pizza (Division)
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We Five (Fact Families)
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