United States. Children's Bureau
and Lundberg, Emma O. (Emma Octavia), 1881-1954.
A Social Study of Mental Defectives in New Castle County, Delaware, Dependent, Defective, and Delinquent Classes Series No. 3, Bureau Publication No. 24 ,
Washington, D.C:
Government Printing Office,
1917, https://fraser.stlouisfed.org/title/8317,
accessed on December 30, 2025.