The employment-certificate system
Subtitle: a safeguard for the working child.
Series: Industrial series -- no. 7; Bureau publication -- no. 56 (revised); Bureau publication (United States. Children's Bureau) -- no. 56 (revised)
Publisher: U.S. G.P.O.
Published: 1921
Place of publication: Washington
Language: eng
Number of pages: 13
Subjects: Child labor