1. 1880 US Federal Census “DDD”
Schedule of Defective, Dependent, and Delinquent Classes
Ginny Winslett

2. Genealogy websites
This Curious 1880 Census Recorded “Idiots,” the Insane, the Sick and the Poor
schedules-defective-dependent-delinquent-classes/
United States Census Defective Schedules
ective_Schedules

3. Genealogy websites
So-called Defective, Dependent, and Delinquent Classes: The DDD Census Schedule for Genealogy
dependent-and-delinquent-classes-the-1880-ddd-census- schedule-for-genealogy/
U.S. Federal Census Schedules of Defective, Dependent, and Delinquent Classes

4. National Archives
1880 Supplemental Schedule 7, for the Defective, Dependent, and Delinquent Classes
forms/1880-census-pauper.pdf
Nonpopulation Census Records

5. Google Search Strings ddd 1880
us federal census schedules of defective dependent delinquent classes 1880