Letter from George F. Lehman to Samuel Jackson, MSS 2/142, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia.
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Letter from George F. Lehman to Samuel Jackson, MSS 2/142, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia. http://localhost:8081/repositories/2/resources/770 Accessed July 23, 2026.