| Understanding the Basics (8 titles) |
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| United States Landmarks (5 titles) |
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| United States Landmarks (7 titles) |
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| United States Landmarks (8 titles) |
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| United States Landmarks (6 titles) |
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| Unsolved Mysteries (6 titles) |
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| U.S.A. Travel Guides (52 titles) |
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| Values (3 titles) |
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| Vowel Blends (12 titles) |
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| Wars in U.S. History (7 titles) |
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| Wars In U.S. History (8 titles) |
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| Weather (4 titles) |
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| Weird-but-True Facts (10 titles) |
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| Weird-but-True Facts (8 titles) |
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| Weird-But-True Facts (12 titles) |
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| Weird Sports (6 titles) |
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| Welcome, Fall! (8 titles) |
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| Welcome, Spring! (7 titles) |
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| Welcome, Summer! (8 titles) |
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| Welcome, Winter! (8 titles) |
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| Welcoming the Seasons (31 titles) |
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| Women's Professional Basketball (6 titles) |
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| Wonders of Space (5 titles) |
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| WordBooks/Libros de Palabras (14 titles) |
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