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Letter from P. O. Wolff, MD, PhD, MA, chief, Addiction-Producing Drugs Section,

World Health Organization, Geneva, Switzerland to Dr. H. Pullar-Strecker, honorary secretary and treasurer for the study of addiction, Wyke House, Isleworth, Middlesex, England, introducing Dr. Leonidas H. Berry from Chicago

Courtesy National Library of Medicine

Page with typewritten text.