Joseph Hartshorne letter to Nicholas Chervin, MSS 2/038-02, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia.
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Joseph Hartshorne letter to Nicholas Chervin, MSS 2/038-02, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia. http://localhost:8081/repositories/2/resources/1360 Accessed July 23, 2026.