| Alternative Energy (8 titles) |
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| Amazing Inventors & Innovators (5 titles) |
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| Ancient Civilizations (1 title) |
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| Animales de colores (Animal Colors) (4 titles) |
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| Animal Friends (6 titles) |
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| Animals with Strength (6 titles) |
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| Backyard Animals (5 titles) |
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| Best Inventions (6 titles) |
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| Bioindicator Species (6 titles) |
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| Biomes (6 titles) |
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| Body Systems (8 titles) |
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| Changing Animals Set 1 (6 titles) |
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| Cutting-Edge Science and Technology (8 titles) |
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| Dogs Set 12 (3 titles) |
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| Early Animal Encyclopedias (6 titles) |
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| Ecosystems of the World (8 titles) |
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| El clima (Weather) (4 titles) |
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| Exploring Our Universe (8 titles) |
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| Family Pets (6 titles) |
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| Geology Rocks! (6 titles) |
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