PT - JOURNAL ARTICLE AU - Treasure, J. A. P. TI - A Study of the Efficiency of Groups of Ex-miners Disabled by Pneumoconiosis employed in Light Industries in South Wales AID - 10.1136/jech.3.3.127 DP - 1949 Jul 01 TA - British Journal of Social Medicine PG - 127--138 VI - 3 IP - 3 4099 - http://jech.bmj.com/content/3/3/127.short 4100 - http://jech.bmj.com/content/3/3/127.full SO - Br J Soc Med1949 Jul 01; 3