| Race in America (6 titles) |
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| Rain Forest Life (6 titles) |
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| Reptiles (6 titles) |
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| Reptiles (Spanish Version) (4 titles) |
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| Royal Animals (6 titles) |
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| Safety for Kids (6 titles) |
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| Science Adventurers (6 titles) |
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| Science Encyclopedias (4 titles) |
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| Science Fact or Science Fiction? (6 titles) |
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| Science of Fun (6 titles) |
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| Science Questions Set 1 (8 titles) |
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| Science Questions Set 2 (6 titles) |
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| Seasons: Fall Fun! (6 titles) |
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| Seasons: Spring Cheer! (6 titles) |
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| Seasons: Summer Shine! (6 titles) |
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| Seasons: Winter Wonder! (6 titles) |
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| Senses (6 titles) |
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| Senses Scavenger Hunt (6 titles) |
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| Sentences (6 titles) |
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| Serial Killers (6 titles) |
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