Almon Twitchell daybooks, MSS 2/280, Volume: 1; Volume: 2. Historical Medical Library of The College of Physicians of Philadelphia.
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Almon Twitchell daybooks, MSS 2/280, Volume: 1; Volume: 2. Historical Medical Library of The College of Physicians of Philadelphia. http://localhost:8081/repositories/2/resources/1382 Accessed July 22, 2026.