| Handling Health Challenges (8 titles) |
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| High Technology (6 titles) |
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| Historical Disasters (6 titles) |
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| History Maker Biographies Set 4 (6 titles) |
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| History of Games (6 titles) |
New! Spring 2025 |
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| Horses Set 2 (6 titles) |
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| How Animals Evolved (6 titles) |
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| How Foods Grow (8 titles) |
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| How Is It Made? Set 1 (6 titles) |
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| How Is It Made? Set 2 (6 titles) |
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| How to Survive (6 titles) |
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| Ice Age Animals (6 titles) |
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| I'm Thinking of An Animal (6 titles) |
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| Incredible Animal Face-Offs (6 titles) |
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| Incredible Insects (6 titles) |
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| Industry Jobs (6 titles) |
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| Insectos (Insects) (3 titles) |
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| Inside Technology (8 titles) |
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| Inside the Military (8 titles) |
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| Interesting Animals (6 titles) |
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