Nathaniel Chapman letter to Dr. Welford, MSS 403, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia.
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Nathaniel Chapman letter to Dr. Welford, MSS 403, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia. https://cpparchives.org/repositories/2/resources/1893 Accessed August 27, 2026.