| Rachel Carson |
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| Racism and Prejudice |
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6.8 |
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| Radical Republicans |
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4.9 |
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| Radisson and des Groseilliers - Fur Traders of the North |
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7.1 |
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| Rainforest Survival Guide |
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| Rats Around Us |
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6.3 |
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| Read, Recite, and Write Cinquains |
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4.2 |
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| Read, Recite, and Write Concrete Poems |
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4.3 |
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| Read, Recite, and Write Free Verse Poems |
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4.6 |
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| Read, Recite, and Write Haiku |
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4.0 |
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| Read, Recite, and Write Limericks |
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4.6 |
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| Read, Recite, and Write List Poems |
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4.4 |
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| Read, Recite, and Write Narrative Poems |
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4.8 |
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| Read, Recite, and Write Nursery Rhymes |
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4.5 |
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| Read the Signals. The Body Language Handbook |
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| Rebellion and Revolt |
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5.2 |
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| Record-breaking Earth |
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5.5 |
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| Recreate Discoveries About Forces |
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| Recreate Discoveries About Light |
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| Recreate Discoveries About Living Things |
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| Recreate Discoveries About Sound |
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| Recreate Discoveries About States of Matter |
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| Recreate Machine Innovations |
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| Recycle |
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