title: A "Nitrous Oxide Gas" Advertising Bookmark from Dr. A. K. Harroun.
mesh_terms: D000329:Advertising / Q000266:history*; D018685:Anesthetics, Inhalation / Q000266:history*; D003815:Dentists / Q000266:history; D049672:History, 19th Century; D006801:Humans; D009609:Nitrous Oxide / Q000266:history*; D014481:United States
chemical_list: D018685:Anesthetics, Inhalation; D009609:Nitrous Oxide