| Perspectives on American Progress (8 titles) |
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| Pets Are Fun! (6 titles) |
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| Playmakers (5 titles) |
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| Poetry Power (6 titles) |
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| Presidents of the United States (45 titles) |
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| Privacy in the Digital Age (6 titles) |
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| Professional Sports Leagues (6 titles) |
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| Protecting Our Planet (6 titles) |
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| Protest Movements (6 titles) |
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| Pro Wrestling's Greatest (5 titles) |
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| Race and American Law (6 titles) |
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| Race and Sports (6 titles) |
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| Race in America (6 titles) |
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| Real Monsters (6 titles) |
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| Robot Innovations (6 titles) |
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| Rocks and Minerals (5 titles) |
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| Saddle Up! (6 titles) |
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| Science Adventurers (6 titles) |
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| Science Fact or Science Fiction? (6 titles) |
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| Science in Action (5 titles) |
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