John C. Otto essay on food allergies and poisoning, MSS 2/235, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia.
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John C. Otto essay on food allergies and poisoning, MSS 2/235, Folder: 1. Historical Medical Library of The College of Physicians of Philadelphia. https://cpparchives.org/repositories/2/resources/968 Accessed August 27, 2026.