| Renewable Energy in Infographics |
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| Respiration |
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| Restaurants by the Numbers |
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6.4 |
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| Restoring Structures |
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4.5 |
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| Returning the Mermaid's Crown |
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| Rights and Values |
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6.1 |
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| Rippin' and Ridin': Extreme Snowboarding |
Soon!
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| Rittenhouse SoundWorks |
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| Rivers |
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5.0 |
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| Road to Recovery (16 titles) |
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| Roanoke Colony |
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3.2 |
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| Robert L. Johnson |
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7.8 |
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| Roberto Clemente |
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6.6 |
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| Robotics Engineer |
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6.5 |
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| Robots |
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6.3 |
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| Robot Scientist |
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5.8 |
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| Robot Scientist |
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5.7 |
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| Rock Climbing |
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5.8 |
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| Rocket League: Beginner's Guide |
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| Rocks |
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