How It Works (10 titles)
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How to Build Our World (4 titles)
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How to Build Our World Complete Set (8 titles)
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How to Build Our World Set Two (4 titles)
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How to Help the Planet (4 titles)
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I Can Play Sports! Series (12 titles)
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Ice Age Animals (10 titles)
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New! Spring 2026 |
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I Love Sports (16 titles⁎)
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Incredible Animal Life Cycles (5 titles⁎)
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Incredible Sports Records (6 titles)
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Insane, Wacky World! (4 titles)
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In Search of the Unexplained Series (10 titles)
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Insects Up Close (20 titles)
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Insect World (12 titles⁎)
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Internet Issues (4 titles)
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In the News: Need to Know (6 titles)
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In the News: Need to Know Set Two (6 titles⁎)
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In the Spotlight (14 titles)
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Intro to Chemistry: Need to Know (6 titles)
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Intro to Physics: Need to Know (6 titles)
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Invasive Species (14 titles)
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Inventions that Changed the World (10 titles)
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Investigating the Unexplained (10 titles)
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In Winter, Where Do They Go?
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