| Crisis in Ukraine (4 titles) |
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| Cutting-Edge Science and Technology (8 titles) |
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| Daily Life in US History (8 titles) |
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| Deadly Diseases (8 titles) |
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| Defining Images (4 titles) |
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| Digging Up the Past (8 titles) |
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| Digital Photography (6 titles) |
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| Dinosaurs (6 titles) |
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| Discover Biology (6 titles) |
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| Discovering the United States (52 titles) |
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| DIY Monsters & Mischief Makerspace (6 titles) |
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| DIY Science Fair Fun! (6 titles) |
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| Dogs Set 1 (1 title) |
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| Dogs Set 10 (3 titles) |
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| Dogs Set 11 (4 titles) |
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| Dogs Set 12 (3 titles) |
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| Dogs Set 13 (1 title) |
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| Dogs Set 8 (4 titles) |
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| Dogs Set 9 (2 titles) |
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| Drones (4 titles) |
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