Medical Messiahs: A Social History of Health Quackery in Twentieth-Century America, by James Harvey Young; Rev. 1992, Princeton University Press. An excellent chronology of nostrums and gadgets, and their court histories. 
The Health Robbers, edited by Stephen Barrett and William T. Jarvis, Published 1993 by Prometheus Books, 59 John Glenn Drive, Buffalo, NY 14228-2197; ph. 716-837-2475.
Four White Horses and a Brass Band by Violet ("Lotus Blossom") McNeal, the colorful and tawdry autobiography of one of the greatest pitch women.
Step Right Up by Brooks McNamara, a history of the American medicine shows, Doubleday and Co.
Nostrums and Quackery by Arthur J. Cramp, MD. Three successive volumes in early 20th century: volume 1, 1911; volume 2, 1921; volume 3, 1936. A comprehensive look at medical quackery in its finest hour, with biting commentary and court histories.
Sears-Roebuck catalog, reprints before 1936.
The Great American Fraud by Samuel Hopkins Adams, Colliers The American Weekly, Oct. 7, 1905-Sept. 1906 (reprinted later by the AMA as a book). This singular, most devastating assault against medical quackery led to the Pure Food and Drug Act.
Notices of Judgement published by the FDA, U.S. Dept of Agriculture (Department of Chemistry pre-WW II.
Rowbottom, M; Suskind, C. 
Electricity and Medicine: History of Their Interaction
(1984) (San Francisco Press, PO Box 6800, San Francisco, CA 94101-6800)Packard, FB; 
(History of some famous quacks) (Johns Hopkins Hospital Bulletin 15:316-323, 1904)
  History of Electrotherapy; Licht, S. (New Haven, CT; Elizabeth Licht Publishing, 1959)
  Franklin's Introduction to Electricity Heathcote, NH de V.; (Isis 46:280-281, 1955)
An Essay on the History of Electrotherapy and Diagnosis Colwell, HA; (London, William Heinemann, 1922)
Quacks of Old London Thompson, CJS; (Philadelphia, PA; JB Lippincot, 1929)
The Doctor in History Haggards, HW;(New Haven, CT; Yale University Press, 1934)
The Man Who Dared the Lightning Fleming, R.(New York, NY; William Marrow Co., 1971)
Bibliographical History of Electricity and Magnetism Mottelay, PF. (New York, NY; Maurizio Martino Publishing, reprinted 1980)
Nostrums and Quackery (American Medical Association, Chicago; Vol. I, 1911; second edition, expanded, 1912. Vol. II, 1921)
Miscellaneous Nostrums (American Medical Association, Chicago, third edition, 1917)
Nostrums and Quackery and Pseudo-medicine, Vol. III (American Medical Association, Chicago, 1936)
The Snake Oil Syndrome--Patent Medicine Advertising Bingham, A. Walker, (1994) (The Christopher Publishing House, Hanover, MA 02339)
The Cults of Unreason Evans, Dr. Christopher, (1973) (Farrar, Straus and Giroux, NY)
Fads and Quackery in Healing Fishbein, Morris, M.D.; (1932) (Covici, Friede, publishers)
The Golden Age of Quackery Holbrook, Stewart H.; (1959) (The Macmillan Co.)
One for a Man, Two for a Horse: A Pictorial History, Carson, Gerald; Grave and Comic of Patent Medicines (1961) (1st edition, color, Doubleday and Co.; 2nd edition, B/W, Bramhall House, NY)
The Technology of the Orgasm: Hysteria, the Vibrator and Women's Sexual Satisfaction Maines, Rachel P.; (1999) (The Johns Hopkins University Press)
The Pill Rollers: Apothecary Antiques and Drug Store Collectibles Richardson, Lillian C. and Charles G.; (1992) (Old Fort Press, Harrison, VA 22801)
Toadstool Millionaires Young, James Harvey; 
American Health Quackery: Collected Essays Young, James Harvey; (1992) (Princeton University Press)
Catalog of X-Ray Apparatus, Electromedical Apparatus, and Allied Apparatus (Cavendish Electrical Company, London, 1912; reprinted by PV Scientific Instruments:
A System for Electrotherapeutics as Taught by the International Correspondence Schools (1899) (The Colliery Engineer Company, Scranton, PA) 
Handbook of Electrotherapeutics Dugan, William James, M.D.; (1909) (F.A. Davis Company) 
A Working Manual of High Frequency Currents Eberhart, Noble M.;(1920); (New Medicine Publishing Co., 25 E. Washington St., Chicago, IL) 
Static High Frequency, Radio, Photo and Radium Therapy King, William Harvey; (1905) (Reprinted by Lindsay Publications, Inc.)
High Frequency Currents Strong, Frederic Finch, M.D.;(1908) (Rebman Company, NY; reprinted by PV Scientific Instruments)