RT Journal Article SR Electronic T1 The Pneumoconiosis Problem JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 331 OP 331 DO 10.1136/oem.16.4.331-a VO 16 IS 4 A1 Higgins, I. T. T. YR 1959 UL http://oem.bmj.com/content/16/4/331.2.abstract AB