| The Human Body (6 titles) |
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| The Power of Energy (8 titles) |
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| The Science of Nature (8 titles) |
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| The Scoop on Superstitions (12 titles) |
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| The Smart Kid's Guide to Everyday Life (8 titles) |
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| The Spark of Invention (8 titles) |
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| The United States Presidents (45 titles) |
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| The World of Insects (8 titles) |
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| The World of Mammals (6 titles) |
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| The World of Money (12 titles) |
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| The World of Reptiles (4 titles) |
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| The World's Greatest Artists (8 titles) |
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| The World's Greatest Athletes (19 titles) |
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| Titanic Stories (6 titles) |
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| Today's MVPs and Champions (8 titles) |
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| Top 10 in Sports (12 titles) |
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| True Animal Stories (6 titles) |
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| True Spy Stories (6 titles) |
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| True Stories, Real People (6 titles) |
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| Understanding Idioms (12 titles) |
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| Understanding the Basics (8 titles) |
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| Unsolved Mysteries (8 titles) |
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| U.S.A. Travel Guides (52 titles) |
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| Weird-But-True Facts (12 titles) |
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