| Regions of the U.S.A. (5 titles) |
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| Respect! (8 titles) |
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| Rev Up Your Writing (7 titles) |
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| Rhyming Word Families (20 titles) |
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| Riddle Fun (8 titles) |
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| Rivers (6 titles) |
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| Roman Mythology (12 titles) |
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| Safari Animal Families (12 titles) |
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| Sayings and Phrases (10 titles) |
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| Scavenger Hunts (8 titles) |
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| Science (5 titles) |
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| Science Around Us (8 titles) |
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| Science Experiments in the Kitchen (8 titles) |
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| Science Showdowns (8 titles) |
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| Scrapbooks of America (10 titles) |
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| Seasons of the Year (4 titles) |
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| Sensational Senses (5 titles) |
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| Sequencing Stories (8 titles) |
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| Service Dogs (6 titles) |
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| Simple Coding (8 titles) |
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| Simple Economics (8 titles) |
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| Simple Machines (6 titles) |
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| Simple Measurement (6 titles) |
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| Simply Math (8 titles) |
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