ฌ็อง ปียาแฌ

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Popularity Prediction Title

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Sociological studies

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The child's conception of number

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The Essential Piaget

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To Understand Is to Invent

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Understanding Causality

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Adaptation and Intelligence

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A formação do símbolo na criança

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Barnets själsliga utveckling

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Behavior and Evolution

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Biologie et connaissance