RT Journal Article SR Electronic T1 A Study of the Efficiency of Groups of Ex-miners Disabled by Pneumoconiosis employed in Light Industries in South Wales JF British Journal of Social Medicine JO Br J Soc Med FD BMJ Publishing Group Ltd SP 127 OP 138 DO 10.1136/jech.3.3.127 VO 3 IS 3 A1 Treasure, J. A. P. YR 1949 UL http://jech.bmj.com/content/3/3/127.abstract AB