Hydrastis canadensis
fascimile, reprint and illustrations of the article in "Drugs and medicines of North America", 1984Lloyd, John UriCincinnati : Lloyd Library, 1908Life and medical Discoveries of Samuel Thomson, and a History of the Thomsonian Materia Medica, as shown in "The New Guide to Health", and the Literature of that Day
Lloyd, John UriCincinnati : Lloyd Library, 1909