concept

Feeble-mindedness, its causes and consequences / by Henry Herbert Goddard.

Mendelism and the problem of mental defect.

A cerebral atlas : illustrating the difference between the brains of mentally defective and normal individuals, with a social, mental and neurological record of 120 defectives during life / by Richard J.A. Berry.

Twelfth annual report of the New York Asylum for Idiots : transmitted to the Legislature February 4th, 1863 / New York State Asylum for Idiots.

On the education of the imbecile / by Dora Greenwell.

Report of the Mental Deficiency Committee : being a joint committee of the Board of Education and Board of Contro.

Walter / by David Cook.

Mentally defective children in the public schools / Walter E. Fernald.

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Intellectual Disability

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Twelfth annual report of the New York Asylum for Idiots : transmitted to the Legislature February 4th, 1863 / New York State Asylum for Idiots.

On the education of the imbecile / by Dora Greenwell.

Report of the Mental Deficiency Committee : being a joint committee of the Board of Education and Board of Contro.

Walter / by David Cook.

Mentally defective children in the public schools / Walter E. Fernald.