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2. Medical portrait George. J. Heuer, M.D.;Zinninger;Cincinnati J Med,1957
3. Letter, Halsted to Boggs, December 16, 1918. The Alan Mason Chesney Medical Archives. #774.
4. Abraham Flexner, “Medical Education in the United States: A Program,” General Education Board Papers. Box 702.
5. Memorandum regarding Mr Rockefeller's Gift to be Devoted to the Improvement of Medical Education in the United States, no author, December 1919. General Education Board Papers. Box 702.