sample="quota" bates="CTRSP_FILES026021" isource="ctr" decade="1970" class="ni" date="19710404" April 4, 1971 Robert C. Hockett, Ph.D. Associate Scientific Director, The Council for Tobacco Research 110 East 59th. Street, New York, New York 10022 Dear Doctor Hockett: After talking with you the other day I called Mrs. Graef at the Mayo Clinic and she advised me that Dr. Berkson is now in Mexico and plans to return sometime during May 1971. She gave me his address which is : Apartado, Postal 197, Manzanillo, Col., MEXICO. She also told me that if one wanted to contact him by phone to call: Mr. Louis Garzia whose phone number is ( believe it or not ) 90. We both thought this mighty strange. I am mailing Dr. Berkson an airmail letter today and hope that he replies. Best wishes. Sincerely, Katherine McD. Herrold, M.D. 11855 - Route 108 Clarksville, Maryland 21029