1. Johnson's therapeutic key Author(s): Johnson, I. D. (Isaac D.), 1827-1911 Publication: Philadelphia : Hahnemann Publishing House, 1899 Subject(s): Homeopathy -- methodsTherapeutics
2. Therapeutic key, or, Practical guide for the homoeopathic treatment of diseases in general Author(s): Johnson, I. D. (Isaac D.), 1827-1911 Publication: New York : Boericke & Tafel, 1881 Subject(s): Homeopathy -- methodsTherapeutics