United States. Children's Bureau , Treadway, Walter L., 1886-1973 , Lundberg, Emma O. (Emma Octavia), 1881-1954 and United States. Public Health Service. Mental Defect in a Rural County : A Medico-Psychological and Social Study of Mentally Defective Children in Sussex County, Delaware, Dependent, Defective, and Delinquent Classes Series No. 7, Bureau Publication No. 48 , Washington, D.C: Government Printing Office, 1919, https://fraser.stlouisfed.org/title/8338, accessed on October 5, 2024.