Administration of child labor laws
Parts 1-4 issued also as Industrial series, no. 2 (U.S. Children's bureau) pt. 1. Employment certificate system, Connecticut.--pt. 2. Employment certificate system, New York.--pt. 3. Employment certificate system, Maryland.--pt. 4. Employment certificate system, Wisconsin.--pt. 5. Standards applicableto the administration of employment-certificate systems
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