Minors in automobile and metal-manufacturing industries in Michigan ..
At head of title: U. S. Department of labor. James J. Davis, secretary. Children's bureau. Grace Abbott, chief Plates printed on both sides "... The field work in connection with this study was supervised by Helen M. Dart, who, together with Ella Arvilla Merritt, has written the report. The occupational descriptons were prepared by E. J. Allett." - Letter of transmittal "A brief bibliography": p. 123-131
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