| Description | Contains a notebook and loose manuscript notes and data on parental age and incidence of Down's syndrome, and a typescript of "Paternal age in mongolism" (sic) for the Lancet, 1962. Also contains correspondence primarily concerning Penrose's requests for dates of birth of relatives of Down's syndrome cases assessed in various studies, and a list of participants for the International Copenhagen Congress on the Scientific Study of Mental Retardation, August 1964. |