| On some of the Mental Affections of Childhood and Youth being the Lettsomian Lectures delivered before the medical society of London in 1887 together with other papers, by J. Langdon Down, MD, 1887. |
| On some of the Mental Affections of Childhood and Youth being the Lettsomian Lectures delivered before the medical society of London in 1887 together with other papers, by J. Langdon Down, MD, 1887. |