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World Health Organisation (WHO) Papers' "by Bowlby and others on psychobiological development, including Piaget, 'Essay on the general problems of the psychobiological development of the child' and comment by Bowlby and others; minutes of the Research Seminar, Feb 1956 to discuss Piaget's paper and Bowlby's reply to it. Attribution-NonCommercial 4.0 International (CC BY-NC 4.0). Source: Wellcome Collection.