RT Journal Article SR Electronic T1 Particle Measurement in Industrial Hygiene JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 298 OP 300 DO 10.1136/oem.13.4.298 VO 13 IS 4 A1 Fairs, G. L. YR 1956 UL http://oem.bmj.com/content/13/4/298.abstract AB