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Epidemiology of mongolism / Abraham M. Lilienfeld, with the assistance of Charlotte H. Benesch.

Professor Jérôme Lejeune.

A method of separating the relative aetiological effects of birth order and maternal age, with special reference to mongolian imbecility / by L.S. Penrose.

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Epidemiology of mongolism / Abraham M. Lilienfeld, with the assistance of Charlotte H. Benesch.

Professor Jérôme Lejeune.

A method of separating the relative aetiological effects of birth order and maternal age, with special reference to mongolian imbecility / by L.S. Penrose.