United States. Children's Bureau
and United States. Council of National Defense. Field Division. Child Conservation Section.
The States and Child Labor : Lists of States with Certain Restrictions as to Ages and Hours, Children's Year Leaflet No. 13, Bureau Publication No. 58 ,
Washington, D.C:
Government Printing Office,
1919, https://fraser.stlouisfed.org/title/8346,
accessed on December 21, 2025.