RT Journal Article SR Electronic T1 Rand Mines Limited (Health Department) Annual Report, Director of Medical Services, 1971 JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 76 OP 76 DO 10.1136/oem.31.1.76 VO 31 IS 1 A1 D. J. Thomas YR 1974 UL http://oem.bmj.com/content/31/1/76.1.abstract AB