Friedrich L. J. Boettcher letter and typescript, MSS 396, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia.
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Friedrich L. J. Boettcher letter and typescript, MSS 396, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia. http://localhost:8081/repositories/2/resources/1757 Accessed July 23, 2026.