Frontiers of knowledge in mental retardation : fifth Congress of the International Association for the Scientific Study of Mental Deficiency (IASSMD) / edited by Peter Mittler ; technical editor, Jean M. de Jong.

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De Jong, Jean M.

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Frontiers of knowledge in mental retardation : fifth Congress of the International Association for the Scientific Study of Mental Deficiency (IASSMD) / edited by Peter Mittler ; technical editor, Jean M. de Jong.