RT Journal Article SR Electronic T1 Effects of exposure to slate dust in North Wales. JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 405 OP 406 DO 10.1136/oem.37.4.405 VO 37 IS 4 A1 Jones, A YR 1980 UL http://oem.bmj.com/content/37/4/405.abstract AB