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4 h 1 min, 9 janv. 1954 ans - In 1954, he was elected the president of the International Union of Scientific Psychology and held this position till 1957.
Ajouté au bande de temps:
7 févr. 2018
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Jean Piaget
Date:
4 h 1 min, 9 janv. 1954 ans
Maintenaint
~ Il y a 70 ans