TY - JOUR T1 - The Determination of Toxic Substances in Air JF - British Journal of Industrial Medicine JO - Br J Ind Med SP - 229 LP - 229 DO - 10.1136/oem.13.3.229-a VL - 13 IS - 3 AU - W. N. Aldridge Y1 - 1956/07/01 UR - http://oem.bmj.com/content/13/3/229.2.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -