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by Haught, John F.
Published 2007
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by Encina, Natalia Florencia
Published 2002.
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Published 2008.
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by Caba Collado, M. Ángeles de la
Published 2000.
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by Piaget, Jean, 1896-1980
Published 1999.
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by Gardner, Howard
Published 2003.
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Published 1993.
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by Hilgard, E. R.
Published 1972.
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