| Milestones in Technology (8 titles) |
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| National Parks (12 titles) |
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| Nature Cycles (8 titles) |
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| Oceans of the World (5 titles) |
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| One World, Many Countries (24 titles) |
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| Our Solar System (10 titles) |
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| Regions of the U.S.A. (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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| Seasons of the Year (4 titles) |
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| Simple Coding (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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| StateBasics (52 titles) |
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| Step-By-Step Experiments (12 titles) |
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| Take It Apart (12 titles) |
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| Technology Then and Now (6 titles) |
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| The Power of Energy (8 titles) |
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| The Science of Nature (8 titles) |
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| The Spark of Invention (8 titles) |
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| The World of Money (12 titles) |
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| U.S.A. Travel Guides (52 titles) |
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