| Professional Football Teams: AFC East (4 titles) |
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| Professional Football Teams: AFC North (4 titles) |
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| Professional Football Teams: AFC South (4 titles) |
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| Professional Football Teams: AFC West (4 titles) |
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| Professional Football Teams: NFC East (4 titles) |
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| Professional Football Teams: NFC North (4 titles) |
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| Professional Football Teams: NFC South (4 titles) |
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| Professional Football Teams: NFC West (4 titles) |
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| PunctuationBooks (8 titles) |
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| Reading Rocks! (12 titles) |
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| 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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| Riddle Fun (8 titles) |
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| Rivers (6 titles) |
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| Roman Mythology (12 titles) |
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| Scavenger Hunts (8 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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| 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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