| La ciencia basica: el cuerpo humano (Beginning Science: Body Systems) (3 titles) |
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| La ciencia basica: la ecologia (Beginning Science: Ecology) (6 titles) |
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| La ciencia basica: las funciones fisicas del cuerpo (Beginning Science: Gross Body Functions) (6 titles) |
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| La migracion animal Set 1 (Animal Migration) (4 titles⁎) |
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| La migracion animal Set 2 (Animal Migration) (6 titles) |
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| Las estaciones: ¡Llega el invierno! (Seasons: Winter Wonder!) (6 titles) |
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| Las estaciones: ¡Llega el otono! (Seasons: Fall Fun!) (6 titles) |
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| Las estaciones: ¡Llega el verano! (6 titles) |
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| Las estaciones: ¡Llega la primavera! (Seasons: Spring Cheer!) (6 titles) |
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| Leading Biographies (6 titles) |
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| Lessons with Aesop's Fables (6 titles) |
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| Let's Measure (6 titles) |
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| Living Through American History (6 titles) |
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| Long Vowels (6 titles) |
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| Los meses (Months) (12 titles) |
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| Luces en el firmamento (Sky Lights) (5 titles) |
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| Maravillas del mundo (World Wonders) (6 titles) |
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| Mascotas presidenciales (6 titles) |
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| Measure It! (6 titles) |
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| Military Animals (6 titles) |
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