TY - JOUR T1 - LEROY UPSON GARDNER JF - British Journal of Industrial Medicine JO - Br J Ind Med SP - 64 LP - 64 DO - 10.1136/oem.4.1.64 VL - 4 IS - 1 AU - K. M. A. P. Y1 - 1947/01/01 UR - http://oem.bmj.com/content/4/1/64.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -