Eliminating feeblemindedness: Ten per cent of american population probably carriers of mental defect-if only those who are actually feebleminded are dealt with, it will require more than 8,000 years to eliminate the defect-new method of procedure needed

Punnett, R. C. (1917). Eliminating feeblemindedness: Ten per cent of american population probably carriers of mental defect-if only those who are actually feebleminded are dealt with, it will require more than 8,000 years to eliminate the defect-new method of procedure needed. Journal of Heredity, 8(10), 464–465. https://doi.org/10.1093/oxfordjournals.jhered.a111653