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Reprint of article from the Proceedings of the Royal Society of London: 'The Relative Aetiological Importance of Birth Order and Maternal Age in Monglism' by L. S. Penrose, 1934.

Collected as part of the 'Hidden Now Heard' oral history project. Funded by the Heritage Lottery Fund, this three year project (2014-17) led by Mencap Cymru captured the histories of residents, their families and staff from six former long stay hospitals in Wales for people with a learning disability. The hospitals included: Bryn y Neuadd Hospital, Llanfairfechan; Ely Hospital, Cardiff; Hensol Castle Hospital, Pontyclun; St David’s Hospital, Carmarthen; The North Wales Hospital, Denbigh; and Llanfrechfra Grange Hospital, Cwmbran.