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The psychology of intelligence. [Translated from the French by Malcolm Piercy and D.E. Berlyne] (International library of psychology, philosophy and scientific method): Piaget, Jean: Amazon.com: Books
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The Psychology of Intelligence - Cognitive Development from Birth to Adolescence (Jean Piaget) - YouTube
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The Psychology of Intelligence (International Library of Psychology, Philosophy, and Scientific Method). by Jean Piaget - 1966.
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