Employment-certificate system, New York
by Helen L. Sumner and Ethel E. Hanks
(Industrial series, no. 2 . Administration of child labor laws ; pt. 2)(Bureau publication / U.S. Department of Labor, Children's Bureau, no. 17)
Government Printing Office, 1917
At head of title: U.S. Department of Labor, Children's Bureau
Government Printing Office
U.S. Department of Labor, Children's Bureau
Government Printing Office