Records of the Secretary Treasurer of the Ballistocardiograph Research Society, MSS 3/004. Historical Medical Library of The College of Physicians of Philadelphia.
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Records of the Secretary Treasurer of the Ballistocardiograph Research Society, MSS 3/004. Historical Medical Library of The College of Physicians of Philadelphia. http://localhost:8081/repositories/2/resources/236 Accessed July 22, 2026.