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- catalog contributor b3711642.
- catalog created "1921.".
- catalog date "1921".
- catalog date "1921.".
- catalog dateCopyrighted "1921.".
- catalog description "Includes bibliographical references (p. 13).".
- catalog extent "13 p. ;".
- catalog isPartOf "Bureau publication (United States. Children's Bureau) ; no. 56 (Rev. 1921)".
- catalog isPartOf "Bureau publication ; no. 56".
- catalog isPartOf "Industrial series (United States. Children's Bureau) ; no. 7 (Rev. 1921)".
- catalog isPartOf "Industrial series ; no. 7".
- catalog issued "1921".
- catalog issued "1921.".
- catalog language "eng".
- catalog publisher "Washington, D.C. : U.S. Dept. of Labor, Children's Bureau,".
- catalog subject "Child labor Law and legislation.".
- catalog subject "HV741 .U58 no.56".
- catalog title "The employment-certificate system : a safeguard for the working child.".
- catalog type "text".