Kahn, Mordecai (ca. 1887-1926), Kahn, Morris (ca. 1891-1934). Historically Significant Archive of Twenty Handwritten Pages of Correspondence, Including Fourteen Original Letters, Documenting the Personal and Professional Relationships of Kahn Brothers, Cardiologists in New York’s Beth Israel and Mount Sinai Hospitals, and Focusing on their Work on Treating Diabetes and Tuberculosis that Eventually Led to the Discovery of Intarvin by Max Kahn in 1923; also Concerning their Lives as Young Jewish American Professionals in New York and Washington, Max’s Work with US FDA, and Max’s Correspondence to their Mother in Yiddish. Washington, New York, Pittsuburg Ca.1910-1920.