| How to Improve at... (10 titles) |
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| Humans in Space (4 titles) |
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| I Can Make Sets (6 titles) |
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| I Can Take Away (4 titles) |
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| I can write a book (8 titles) |
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| If These Fossils Could Talk (4 titles) |
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| I Learn with Dinosaurs (4 titles) |
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| I Live With (6 titles) |
NEW
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| I Love the Seasons (4 titles) |
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| Important United States Moments (6 titles) |
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| Improving Your Social Skills (6 titles) |
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| Incredible Changes on Earth (6 titles) |
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| Insects Close-Up (8 titles) |
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| In the Footsteps of Explorers (24 titles) |
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| Introducción a los hábitats (Introducing Habitats) (12 titles) |
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| Introducción a los seres vivos (Introducing Living Things) (8 titles) |
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| Introducing Habitats (12 titles) |
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| Introducing Living Things (10 titles) |
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| Introduction to Earth's Resources (6 titles) |
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| Inventions that Shaped the Modern World (4 titles) |
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| Investigating Body Systems (4 titles) |
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| Investigating Human Migration and Settlement (6 titles) |
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| Investigating Science Challenges (6 titles) |
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| I Read! You Read! Level 1 (10 titles) |
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