00820cam a22002051 4500 e 15001132 DLC 20260227111204.0 860909s1913 pau 000 0 eng c e 15001132 (OCoLC)14199035 U.S. Bur. of Education CU DLC HD6250.U5 A8 Armstrong Association of Philadelphia. A comparative study of the occupations and wages of the children of working age in Potter and Durham schools, Philadelphia. Made under the auspices of the Armstrong Association of Philadelphia. [Philadelphia, Printed by pupils at the Philadelphia trades school] 1913. 20 p. 23 cm. Child labor Pennsylvania Philadelphia. Philadelphia. Board of Public Education. 19830 19830