What Causes an Earthquake?
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World of Whales (6 titles)
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I Spy Stars
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Working Horses (4 titles)
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Parrots
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Iguanas
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Earth Basics (4 titles)
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Rocks
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La tierra (Soil)
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Blue Whales
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Sloths
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Cachorros de zorrillo en la naturaleza (Skunk Kits in the Wild)
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Why Does Lightning Strike?
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Minerals
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Materiales de la Tierra (Eath Basics) (4 titles)
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Los perezosos (Sloths)
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Cachorros de castor en la naturaleza (Beaver Kits in the Wild)
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How Does a Tornado Form?
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Squirrel Kits in the Wild
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Sperm Whales
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Farmer's Market Fun: Our Friend Mina Is Blind
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El agua (Water)
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Police Horses
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The Penguin Party: Our Friend Nolan Has Autism
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