| Rocks and Minerals (6 titles) |
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| Savanna Animals (6 titles) |
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| Science Concepts (6 titles) |
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| Sentences (6 titles) |
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| Sharks (6 titles) |
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| Sharks (6 titles) |
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| Slithering Snakes (6 titles) |
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| Sneakerheads (6 titles) |
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| Space Technology (6 titles) |
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| Sports Biographies Set 1 (6 titles) |
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| Sports Biographies Set 2 (6 titles) |
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| Sports Biographies Set 3 (8 titles) |
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| Star Biographies (6 titles) |
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| Stars of Music (6 titles) |
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| Stellar Space (6 titles) |
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| Superhero Animals (6 titles) |
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| Super Structures (6 titles) |
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| Trailblazing Athletes (6 titles) |
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| Trains (6 titles) |
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| US Armed Forces (6 titles) |
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