00817cam a22002291 4500 l 39000104 DLC 20260227111537.0 800418s1939 dcua b f000 0 eng c l 39000104 (OCoLC)6218327 U.S. Dept. of labor. Libr. OCl DLC premarc HD7264 .U6 1939a United States. Bureau of Labor Standards. Silicosis prevention; dust control in foundries. United States Department of labor. Frances Perkins, secretary. Division of labor standards. Verne A. Zimmer, director. Washington, U.S. Govt. print. off., 1939. iii, 25 p. illus., diagrs. 23 cm. "Selected references": p. 25. Lungs Dust diseases. Foundries. 36302 36302