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I Care About (6 titles)
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If I Was A… (6 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)
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I Love the Seasons (4 titles)
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Imagine That! Adventures (5 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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In My Community (10 titles)
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Insane Speed (7 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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Investigating Science Challenges (6 titles)
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I Read-n-Rhyme (11 titles)
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I Read! You Read! Level 2 (10 titles)
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I Read! You Read! Level 3 (10 titles)
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I Read! You Read! Level 4 (10 titles)
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Canada
USA
