| Transforming Animals (6 titles) |
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| Transportation (3 titles) |
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| Trucks at Work (6 titles) |
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| Twilight Animals (6 titles) |
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| Underground Animals (8 titles) |
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| Understanding You (6 titles) |
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| United States President Biographies (8 titles) |
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| Unusual Animals (6 titles) |
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| U.S. Armed Forces (6 titles) |
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| US Symbols (6 titles) |
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| US Symbols (6 titles) |
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| Veo, veo un animal (I'm Thinking of an Animal) (6 titles) |
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| Vowel Teams (6 titles) |
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| Weather Watch (4 titles) |
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| Who Would Win? (20 titles) |
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| Word Families (6 titles) |
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| World of Mythical Beings (6 titles) |
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| World of Mythical Beings Set 2 (6 titles) |
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| World Religions (6 titles) |
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| World Safaris (6 titles) |
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