United States. Division of Labor Standards. (1939). Silicosis prevention, dust control in foundries. [s.n.].
Chicago Style (17th ed.) CitationUnited States. Division of Labor Standards. Silicosis Prevention, Dust Control in Foundries. [Washington]: [s.n.], 1939.
MLA (9th ed.) CitationUnited States. Division of Labor Standards. Silicosis Prevention, Dust Control in Foundries. [s.n.], 1939.
Warning: These citations may not always be 100% accurate.