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4 ore 1 min, 9 gen 1954 anni - In 1954, he was elected the president of the International Union of Scientific Psychology and held this position till 1957.
Aggiunto al nastro di tempo:
7 feb 2018
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Jean Piaget
Data:
4 ore 1 min, 9 gen 1954 anni
Adesso
~ 70 years ago