Occupational hazards to young workers no.4
No. 1-6 issued as U.S. Children's Bureau. Bureau publication; no. 7 issued as U.S. Bureau of Labor Standards. Child-labor series no. 1. The explosives-manufacturing industries. 1942 -- no. 2. Motor-vehicle drivers and helpers. 1941 -- no. 3. The coal-mining industry. 1942 -- no. 4. The logging and sawmilling industries. 1942 -- no. 5. Woodworking machines. 1942 -- no. 6. Radioactive substances. 1942 -- no. 7. The operation of hoisting apparatus. 1946 -- no. 8. The operation of power-driven metal-forming, punching, and shearing machines. 1951 -- no. 9. Mining other than coal No. 4a-4b never published No. 4c and 8 issued by Wage and Hour and Public Contracts Divisions No. 7 issued by the bureau under its earlier name: Division of Labor Standards
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