Tilden, J. H., M.D. (1921). _Appendicitis_ (Reprinted by Health Research, Mokelumne Hill, CA, 1976). Denver: John Tilden. Tilden, J. H., M.D. (1921). _Impaired Health: Its Cause and Cure_ (reprint of original ca. 1920). Mokelumne Hill, California: Health Research. Tilden, J. H., M.D. (1939). _Constipation: A New Reading on the Subject_ (Reprinted 1960 by Health Research, Mokelumne Hill, California). Denver, Colorado: John Tilden. Tilden, J. H., M.D., & Trail, R. T., M.D. (1926). _Toxemia Explained & The True Healing Art_ (reprint of two original articles; also available through Health Research). Yorktown, Texas: Life Science. Voisin, Andre. (1959). _Soil, Grass and Cancer._ New York: Philos. Library. Voisin, A. (1963). _Grass Tetany._ London: Crosby Lockwood and Son Ltd. Walford, Roy L. M.D. (1983) _Maximum Lifespan._ New York: Avon, 1983. Walford, Roy L. M.D. (1986) _The 120-Year Diet: How to Double Your Vital Years._ New York: Simon and Schuster. Weindruch, Richard and Walford, Roy L. (1989) _The Retardation of Aging and Disease by Dietary Restriction._ Springfield, Illinois: Charles C. Thomas. Whorton, J. (1974). _Before Silent Spring: Pesticides and Public Health in Pre-DDT America._ Princeton, New Jersey: Princeton University Press. Wigmore, Ann D.D. (1964) _Why Suffer? The Answer? Wheatgrass God's Manna!_ Boston: Hippocrates Health Institute. Williams, R. J. (1971). _Nutrition Against Disease._ New York: Pitmann. Williams, R. J. (1975). _Physicians' Handbook of Nutritional Science._ Springfield, Illinois: Charles W. Thomas. Wrench, G. T., M.D. (1938). _The Wheel of Health _(Reprinted 1960 by the Lee Foundation for Nutritional Research; Reprinted by Bernard Jensen International, Escondido, CA, 1990. ed.). London: C.W. Daniel Company Ltd. Wylie, H. W. (1915). _Not By Bread Alone: The Principles of Human Nutrition._ New York: Hearst's International Library. Wylie, H. W. (1929). _The History of a Crime Against the Food Law_ (Reproduced by Lee Foundation for Nutritional Research, Milwaukee, 1955 ed.). Washington, D.C.: H. W. Wylie. Wylie, H. W. (1930). _An Autobiography._ Indianapolis: Bobbs-Merrill.