Bicentenary of nitrous oxide.
D000766:Anesthesia, Dental / Q000266:history; D000769:Anesthesia, Inhalation / Q000266:history; D049671:History, 18th Century; D049672:History, 19th Century; D006801:Humans; D009609:Nitrous Oxide / Q000266:history* / Q000302:isolation & purification; D006113:United Kingdom; D014481:United States
D009609:Nitrous Oxide