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Piaget, Jean
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Isaacs, Susan <1885-1948>
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Saglione, Gianfranco
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Piaget, Jean
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Saglione, Gianfranco
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Isaacs, Susan <1885-1948>
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Mead, Margaret
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Piaget, Jean
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Isaacs, Susan <1885-1948>
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Piaget, Jean
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Gallie, W. B.
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Piaget, Jean
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Richardson, Elizabeth
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Russell, Bertrand
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Inhelder, Bärbel
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Piaget, Jean
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Isaacs, Susan <1885-1948>
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Piaget, Jean
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Quaglia, Rocco <1946- >
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Hadfield, James Arthur
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Isaacs, Susan <1885-1948>
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Petter, Guido
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Gill, Leslie Ernest
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Cohen, John <1911- >
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Berge, André
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Isaacs, Susan <1885-1948>
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Piaget, Jean
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Piaget, Jean
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Petter, Guido
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