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Letter from Leonidas H. Berry, to Fred A. Hertwig, superintendent, Cook County Hospital,
requesting that a telephone be installed in Room 213 of the Durand Building as he is the principal investigator for a research project
Courtesy National Library of Medicine
![Page with typewritten text.](http://www.nlm.nih.gov/exhibition/forallthepeople//img/dg_1339_Lg.jpg)
Topic:
Dr. Berry's CareerCreator:
Leonidas H. BerryDate:
April 13, 1970