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Returning to Guatemala
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4.5 |
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Return to the Moon
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Rihanna
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5.2 |
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River and Coast Geo Facts
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Rivers and Lakes
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5.7 |
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Rivers and Lakes Inside Out
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6.3 |
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Rivers Around the World (8 titles⁎)
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RMS Queen Mary
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Roald Amundsen: The Conquest of the South Pole
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7.3 |
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Roberta Bondar: Canada's First Woman in Space
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Robert Pattinson
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6.2 |
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Robot Brains
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7.3 |
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Robotics
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6.2 |
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Robotics Engineering and Our Automated World
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Robot Voyagers
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6.8 |
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Robot Warriors
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Robot Workers
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Robozones (4 titles⁎)
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Rockets and Missiles
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6.2 |
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Rocks and Minerals
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5.8 |
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Rocks, Minerals, and Resources (10 titles⁎)
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Rocky Mountains Research Journal
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5.5 |
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Rodeo
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5.3 |
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Romans: Dress, Eat, Write, and Play Just Like the Romans
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Canada
USA
