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30 apr 1930 anni - "El Desarrollo de las Cantidades Físicas en el Niño". "De la lógica del niño a la lógica del Adolescente"

Aggiunto al nastro di tempo:

Jean Piaget

14 ott 2018

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517

Data:

30 apr 1930 anni

Adesso

~ 95 years ago

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