Holidays (18 titles)
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Horse Power
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Hound Town Chronicles (8 titles)
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How Does It Work? (11 titles)
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How Does it Work?: Farm Tech Set (4 titles)
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How Is It Made? (6 titles)
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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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If I Met an Ice Age Animal (6 titles)
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I Love Reading: Dino World
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I Love Sports (18 titles⁎)
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Incredible Animal Life Cycles (5 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 (15 titles⁎)
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Internet Issues (4 titles)
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In the Spotlight (14 titles)
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Invasive Species (14 titles)
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In Winter, Where Do They Go?
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It's a Disaster!
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