| Understanding the Civil War (8 titles) |
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| Under the Sea Animals (8 titles) |
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| Unsolved! (12 titles) |
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| U.S. Landmarks (8 titles) |
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| Vehicles on the Move (24 titles) |
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| Vehículos en Acción (Vehicles on the Move) (4 titles) |
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| Voices for Freedom (8 titles) |
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| Voices for Green Choices (6 titles) |
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| Watch this Space! (4 titles) |
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| Weather Close-Up (4 titles) |
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| Weird Animals (6 titles) |
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| Well Made, Fair Trade (4 titles) |
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| What Am I? (4 titles) |
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| What Animal Has These Parts? (6 titles) |
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| What Color Are My Feelings? (4 titles) |
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| What Kind of Animal is it? (10 titles) |
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| What's the Matter? (10 titles) |
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| When Dinosaurs Ruled the Earth (6 titles) |
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| Where Do I Live? (6 titles) |
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| Where Food Comes From (4 titles) |
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| Where Materials Come From (4 titles) |
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| White Marlin (6 titles) |
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| Who Lives in a Barn? (6 titles) |
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| Why Chemistry Matters (10 titles) |
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Canada
USA
