Chevalier Jackson chalk drawing, "Stop, check, bypass", MSS 470, Flat File: Case 1, Drawer: 2. Historical Medical Library of The College of Physicians of Philadelphia.
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Chevalier Jackson chalk drawing, "Stop, check, bypass", MSS 470, Flat File: Case 1, Drawer: 2. Historical Medical Library of The College of Physicians of Philadelphia. http://localhost:8081/repositories/2/resources/2130 Accessed July 22, 2026.