| Outbreak! (6 titles) |
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| Outdoor Adventures (8 titles) |
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| Outdoor Encyclopedias (4 titles) |
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| Pandemics (6 titles) |
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| Phantom Finders (6 titles) |
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| Pirates (6 titles) |
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| Plants vs. Zombies Set 1 (12 titles) |
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| Plants vs. Zombies Set 2 (9 titles) |
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| Plants vs. Zombies Set 3 (6 titles) |
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| Plants vs. Zombies Set 4 (6 titles) |
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| Pokemon Phenomenon (6 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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| 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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| Science Adventurers (6 titles) |
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| Science Encyclopedias (4 titles) |
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