00817cam a22002291  4500001001300000003000400013005001700017008004100034010001700075035001900092040004100111042001200152050002200164110004700186245017400233260004800407300004000455504003400495650002600529650001500555999001700570l  39000104 DLC20260227111537.0800418s1939    dcua     b   f000 0 eng c  al  39000104   a(OCoLC)6218327  aU.S. Dept. of labor. Libr.cOCldDLC  apremarc00aHD7264b.U6 1939a1 aUnited States.bBureau of Labor Standards.10aSilicosis prevention;bdust control in foundries.cUnited States Department of labor. Frances Perkins, secretary. Division of labor standards. Verne A. Zimmer, director.  aWashington,bU.S. Govt. print. off.,c1939.  aiii, 25 p.billus., diagrs.c23 cm.  a"Selected references": p. 25. 0aLungsxDust diseases. 0aFoundries.  c36302d36302