References:

Gaucher-Peslherbe PL. Chiropractic: early concepts in their historical setting. Lombard IL: National College of Chiropractic, 1994
Keating JC. The embryology of chiropractic thought. European Journal of Chiropractic 1991 (Dec); 39(3): 75-8
Keating JC. The evolution of Palmer's metaphors and hypotheses. Philosophical Constructs for the Chiropractic Profession 1992 (Sum); 2(1): 9-19
Keating JC. Old Dad Chiro comes to Portland, 1908-10. Chiropractic History 1993 (Dec); 13(2): 36-44
Keating JC. "Heat by nerves and not by blood": the first major reduction in chiropractic theory, 1903. Chiropractic History 1995 (Dec); 15(2): 70-77
Lillard H. Deaf seventeen years. The Chiropractic 1897a (Jan); Number 17 (Palmer College Archives), p. 3
Palmer DD (Ed.): The Magnetic Cure 1896 (Jan); Number 15 (Palmer College Archives, Davenport, Iowa)
Palmer DD (Ed.): The Chiropractic 1897a (Jan); Number 17 (Palmer College Archives)
Palmer DD (Ed.): The Chiropractic 1897b (March); Number 18 (Palmer College Archives)
Palmer DD (Ed.): The Chiropractic 1899; Number 26 (Palmer College Archives)
Palmer DD (Ed.): The Chiropractic 1900; Number 26 (Palmer College Archives)
Palmer DD (Ed.): The Chiropractic 1902; Number 29 (Palmer College Archives)
Palmer DD. The history and philosophy of chiropractic. The Chiropractor 1906 (Oct); 2(11): 39-42
Palmer DD. The chiropractor's adjuster: the science, art and philosophy. Portland OR: Portland Printing House, 1910
Palmer DD. The chiropractor. Los Angeles: Beacon Light Printing Company, 1914
Rehm WS. Legally defensible: chiropractic in the courtroom and after, 1907. Chiropractic History 1986; 6: 50-5

This information was obtained from Joseph C. Keating, Jr., Ph.D from the Chiropractic History Archives.