Document Ne3qJpx9oZrw5VNN1zrVJQGDV

FILE NAME DuPont DUP DATE 1967 July 5 DOC DUP052 DOCUMENT DESCRIPTION Letter to Dr. Harriet L. Hardy Asst Medical Director in Charge of Occupational Medicine Service MIT - from G.J. Stopps A es coe Dr. Harriet L. Hardy Assistant Medical Director in Charge of Occupational - coe A pon Medicine Service Room 20B Kassachusetts Institute of Technology Cambridge Massachusetts 02139 . mee Dear Dr. Hardy Englandin industries using In common with many persons we are frequently of asbestos substantial quantities industrial hygiene asked for guidance in setting recent conversation standards for this mineral A suggested that with Dr. Dixon of Pisons the various there may be a real difference between ability to cause in regard to their is then be forms of asbestos would My first question the Desotheliomate and does it apply to there such a difference of the lung and gastro- other less specific tumors with asbestos intestinal tract also associated in tumorigenicity Secondly if there is such & difference is it of a suffi- between the various forms of asbestos recommendation to to be the basis for a cient degree handling management on asbestos Yours sincerely ORIGINAL SIGNED BY G. J. STOPPS G. J. Stopps M.B. Chief Physiology Section GJS J.1C