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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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Way, Lewis
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Bouton, Charles Pierre
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Bazalgette, John
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Glueck, Sheldon
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Aebli, Hans
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Piaget, Jean
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