RT Journal Article SR Electronic T1 Guiding Principles for the Organization of Occupational Medical Services in Places of Employment JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 227 OP 228 DO 10.1136/oem.13.3.227 VO 13 IS 3 A1 Graham, J. C. YR 1956 UL http://oem.bmj.com/content/13/3/227.abstract AB