| The Medieval World (20 titles) |
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| The Original Six: Celebrating Hockey's History (6 titles) |
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| The Science Behind the Athlete (6 titles) |
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| The Science of Catastrophe (4 titles) |
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| The Science of Nutrition (6 titles) |
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| The Super Starz (6 titles) |
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| The Thoughtful Octopus series (6 titles) |
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| The World's Most Dangerous Jobs (10 titles) |
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| Today's Stars (6 titles) |
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| Top Doodle Dog Breeds (6 titles) |
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| Top High School Sports (6 titles) |
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| Top Horse Breeds (6 titles) |
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| Top Secret Science (6 titles) |
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| Top Sports Championships (6 titles) |
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| Top Trade Careers (6 titles) |
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| Travel with the Great Explorers (24 titles) |
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| Uncovering the Past: Analyzing Primary Sources (20 titles) |
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| Underground Worlds (6 titles) |
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| Understanding Electricity (4 titles) |
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| Understanding Geology (6 titles) |
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| Understanding Mental Health (6 titles) |
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| Understanding the American Revolution (8 titles) |
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| Understanding the Civil War (8 titles) |
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| Unsolved! (12 titles) |
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Canada
USA
