This primary source comes from the Records of the Patent and Trademark Office.
Full Citation: Dr. L. E. Keeley's Double Chloride of Gold Cure for Drunkenness Label; 8/10/1880; 2324 - Dr. L. E. Keeley's Double Chloride of Gold Cure for Drunkenness - Leslie E. Keeley; Case Files for Registered Product Labels , 1874 - 1940; Records of the Patent and Trademark Office, Record Group 241; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/documents/document/keeleys-cure-drunkenness, April 25, 2024]