William Zentmayer memoir of Dr. Posey, MSS 2/105, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia.
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William Zentmayer memoir of Dr. Posey, MSS 2/105, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia. http://localhost:8081/repositories/2/resources/346 Accessed July 22, 2026.