RT Journal Article SR Electronic T1 Recommended Health Based Limits in Occupational Exposure to Selected Mineral Dusts (Silica, Coal) JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 706 OP 706 DO 10.1136/thx.41.9.706 VO 41 IS 9 A1 CACP YR 1986 UL http://thorax.bmj.com/content/41/9/706.1.abstract AB