RT Journal Article SR Electronic T1 International Symposium on the Medical Inspection of Labour JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 329 OP 330 DO 10.1136/oem.21.4.329-a VO 21 IS 4 A1 Murray, R. YR 1964 UL http://oem.bmj.com/content/21/4/329.2.abstract AB